Scale: 288,895
Getting Started with the Comprehensive Viewer

Welcome to the Prince William County Comprehensive Map Viewer

The Viewer has three sections.

  • The Map Window where the map is displayed.
  • The Map Contents and “Legend” panels which float over the right side of the map window and list the data that can be selected to view in the map window.
  • The Tool Bar, located along the top which gives the users some tools and controls for navigation and analysis.

The viewer opens centered on the jurisdiction with the jurisdiction boundary shown in gray. Please wait for the viewer to fully load (the jurisdiction boundary will be displayed) before you initiate any actions.

The default image you see in the background is from the ESRI WorldView database. The imagery is selected because it is a uniform scale throughout the region. The data presented in this viewer and the data used in the models are NOT derived from this product. Data are derived from the MOST RECENT image sources available at the time of the shoreline inventory. See the metadata file(s) for specific information on dates.

To close the welcome pane, click on the home icon in the upper right corner of this pane.

Map Contents:

From the panels on the right titled “Map Contents” and “Legend”, the user may check various attribute layers on or off. As layers are turned on, their legends appear in the lower Legend panel. Use the scroll bars to view more content in the panels. The panel windows can be closed by clicking on the close panel icon buttons to the right of “Map Contents” and “Legend” headers. To restore the map contents panel, click on the layers icon. To re-open the legend panel, click the legend icon button. These buttons appear in the tool bar when the map contents and legend panels are closed.

View Map Contents:

To view map contents in the map window select your attribute layers of interest in the right panel as indicated above. The layers will be displayed in the map window. If the layer has solid filled polygons, a transparency slider will also appear. Move the transparency handle to the left to increase transparency. Zoom to an area of interest. For details at any site, click on a location in the map window. From the pop-up window that appears, use the white arrow button (top right of popup window) to page through the layers returned. Note: information can only be retrieved for layers that are selected in the map content panel.

Shoreline Conditions Layers: Shoreline conditions are surveyed using field surveys and remote sensing techniques. The conditions observed during those surveys can be viewed here by selecting the features of interest. The digital data can be downloaded from the William & Mary Publish CCRM GIS data site or click here to return to the “Virginia Coastal Zone Locality Portals” page and select “Prince William County”.

Preferred Shoreline Best Management Practices (BMP): These practices, delineated along the shoreline, reflect the preferred approach for erosion control based on observed shoreline conditions at the time of the analysis. The delineation was developed from a geo-spatial model that accounts for site characteristics such as presence of marsh, beach, and submerged aquatic vegetation, nearshore depth, exposure to waves, and location of primary structures (e.g. homes). The recommendations reflect the Commonwealth's preferred approach for shoreline stabilization; using living shoreline treatments wherever adequate erosion control can be achieved.

The assessment was conducted at parcel level scale but the output represents a reach based or cumulative approach to shoreline management. In some instances, specific site conditions, including the presence of existing erosion control structure, lot size, or proximity of primary buildings to the shoreline, may alter the recommendation. For more explicit, on-site decision making refer to the Decision Tree Shoreline Management Options. The Decision Trees lead users through a series of questions about shoreline characteristics and result in recommendations of environmentally preferable treatments for the shoreline. For more information and to view the Decision Trees please click here.

Sea Level Rise High Scenario: This scenario is one of three sea level rise scenarios that are presented in the Sea Level Rise Risk and Vulnerability Tool (see the Toolbox). These scenarios are based on projections reported in the 2014 National Climate Assessment. The “High” scenario shown here is based on the upper end of projections from semi-empirical models using statistical relationships in global observations of sea level and air temperature. The rate of sea level rise through time is non-linear and adjusts for anticipated acceleration. For more information see The Sea Level Rise Inundation Tool - User Guide, 2017 on the Sea Level Rise Risk and Vulnerability Tool website.

To view the Sea Level Rise Scenario, click the check box to the left of "Sea Level Rise High Scenario in the Map Contents panel. The upper slide bar controls the layer transparency. The lower bar is the time slider. Click the play button to the left of the time slider to view water inundation progression through 6 time periods (2012, 2020, 2040, 2060, 2080, and 2100). The buttons to the right of the time slider allow the user to step through the time periods (forward or backward). The slider thumb button can also be dragged to move to the time period of choice.

Other Layers: Additional layers that may be of interest to the user are found here. These layers may vary depending upon locality and could include hydrology, submerged aquatic vegetation(SAV), conservation lands, resource protection areas, bathymetry, private lease boundaries, photographs, etc.

Base and Imagery Layers: Virginia Base Map (VBMP) imagery and ESRI base maps are provided should the user desire a different background. VBMP imagery displays at a scale of 1:2,257 and above. It will disappear at a scale of 1:1,128. The ESRI base imagery, Streets, and World Topo Map will display at a scale of 1:1,128 and above. Light Gray Canvas displays at 1:9,027 and above. The current map scale is displayed in the bottom left corner of the map window.

Top Tool Bar:

Navigation:

Use the navigation buttons near the upper left of the map to zoom in, zoom out, go to previous extent, go to last extent, and pan. To return to the original (default) extent, click the home icon home icon in the upper left map corner.

Clear Graphics:

Clears any graphic that was added to the map.

River System Pie Charts:

These pie charts display distribution statistics of riparian land use and shoreline hardening for water bodies selected from the drop down menu in the upper left. The selected river will be highlighted in blue on the map. Jurisdiction-wide statistics for both metrics can be viewed by selecting the buttons at the bottom of the window. Click on the Prince William Summary PDF button to open a new window that display more detailed results in table format. To close this window click the “River System Pie Charts” button in the tool bar or click the close icon in the upper right corner of the Pie Charts pane. Click the “Clear Graphics” button to remove the highlighted area from the map. Clearing the graphics will not alter the pie chart.

Information/Help:

Click the down arrow to the right of “Information/Help” to open a dropdown menu. The “Getting Started” button reopens this window at any time. “Metadata” contains information about the data layers in the Map Contents along with links to metadata. The “ShlInv Glossary” button links to a glossary defining attributes contained within the “Shoreline Condition Layers”. Click the “BMP Glossary” button for a glossary defining the preferred shoreline best management practices.

Address Locator:

Click the “Find Address” button and enter an address in the search tool. Click the magnifying glass button to search for the address. If an address is found, the map will zoom to the location and mark the spot with a blue symbol. To close the tool, click on the “Close Address” button in the top tool bar. To clear the address and the marker, click the “X” in the search tool (only appears if the user has entered text), or click the Clear Graphics button on the tool bar.
This tool can also be used to search by x,y coordinates (decimal degrees). Enter the longitude and latitude (ex.: -77.52, 38.54).

Measure:

Opens the Measurement widget. Tools are provided to measure area and distance, or determine the x,y coordinate location. Click the desired measurement tool then click the map. A second click on the tool button will disable the measurement tool. Click “Measure” located on the tool bar to hide the Measurement widget or click the close icon in the upper right corner of the Measurements pane.

Swipe Tool:

Opens the Swipe Tool widget. Choose an image to swipe by clicking on the circle to the left of the image name. The image chosen will display on top of all layers checked on in the Map Contents. The swipe image is preset to 90% opacity. Click the Swipe button to enable the swipe widget. The chosen imagery will always display on the left side of the swipe bar. The Hide Swipe button clears the swipe image and hides the swipe bar. To close the Swipe Tool, click “Swipe Tool” located on the tool bar or click the close icon in the upper right corner of the Swipe Tool pane.

Printing:

Click the “Print” button to open a print configuration window. Enter a name for the map in the text box. Select the map layout from the dropdown menu. Choices are landscape or portrait. Click the “Print Map” button. Be patient, there may be a short wait before a pdf of the map opens in a new tab. Make sure your browser allows pop-ups.

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Viewer updated: May 6, 2019

Metadata Links

Metadata is data about data. To find out more information about the layers used in this viewer, right click on a link to open metadata in a new tab.

Note: Firefox users, you may have to refresh the newly opened metadata page to view the metadata if the file is a .pdf.

  • Bathymetry
  • Conservation Easements
  • Conservation Lands
  • Hydrology
  • Jurisdictional Boundary
  • National Wetlands Inventory Layers extracted from NWI: Intertidal Flats (attributes with classification of Estuarine Intertidal Unconsolidated Shore(E2US) or Marine Intertidal Unconsolidated Shore(M2US)) and Open Water (classification of Estuarine Subtidal(E1), Marine Subtidal(M1), Palustrine Aquatic Bed(PAB), Palustrine Unconsolidated Bottom(PUB), or any Riverine or Lacustrine with Unconsolidated Bottom(R#UB, L#UB)).
  • Parcels
  • Preferred Shoreline Best Management Practices
  • SAV
  • SAV Habitat
  • Shoreline Condition Layers:
  • Tidal Marsh Inventory
  • ESRI Base Maps and Imagery:
  • Virginia Administrative Boundaries (Jurisdictional Boundary)
  • Virginia Base Map (VBMP) Imagery:
    • The following paragraphs are excepts from the service descriptions for each imagery layer. The map services are provided by Virginia Information Technologies Agency (VITA).
    • VBMP 2017: "Orthoimagery collected in Spring 2017 by the VBMP program for Virginia."
    • VBMP 2013: "Orthoimagery collected in Spring 2013 by the VBMP program for some areas of Virginia."
    • VBMP 2011: "Orthoimagery collected in Spring 2011 by the VBMP program for the western half of Virginia and some eastern urban areas."
    • VBMP 2009: "Orthoimagery collected in Spring 2009 by the VBMP program for the eastern half of Virginia."
    • VBMP 2006: "Orthoimagery collected in Spring 2006 by the VBMP program for the eastern half of Virginia."
    • All the "imagery is displayed in true color (RED, GREEN, BLUE). The spatial reference is WGS 1984 Web Mercator (Auxiliary Sphere). The imagery is tiled at 12 levels from 1:4,622,324 to 1:2,257. The imagery was collected to meet ASPRS Class 1 orthoimagery standards. Most areas were collected at a 1-ft ground sample distance (GSD), with some urban areas upgraded to 6-inch and 3-inch GSD. - 'Any determination of topography or contours, or any depiction of physical improvements, property lines or boundaries is for general information only and shall not be used for the design, modification, or construction of improvements to real property or for flood plain determination.' Subsection C of § 54.1-402"
Shoreline Management Model Glossary

Shoreline Management Model Version 5.1 - Preferred Shoreline Best Management Practices

Printable pdf version of SMM v.5.1 Glossary


Groin Field with Beach Nourishment.
Maintain existing wide beach between groins. Remove unnecessary structures at the backshore (e.g. bulkheads) and stabilize the bank with grading and riparian plants. Repair/replace existing groins, add beach nourishment and plant beach vegetation.
Maintain Beach or Offshore Breakwater with Beach Nourishment.
If shoreline exceeds 200 feet in length, remove existing shoreline structure, add beach nourishment sand, consider offshore breakwaters or another type of wave attenuation device with beach nourishment; consider adding plantings to the nourished areas. When the shoreline length is less than 200 feet an offshore breakwater may not be practical. In this case, remove failed shoreline structures and repair or construct a revetment as far landward as possible. Consider shoreline enhancement such as creation of vegetated wetlands and/or riparian buffer and/or sandy beach/dune above and immediately channelward of the structure.
Non-Structural Living Shoreline.
Remove existing shoreline structure if present; grade bank if necessary and install a non-structural living shoreline which may include riparian buffer planting along the bank, and/or marsh plants, coir logs, or oyster reefs along the shoreline. Best choice for low energy environments.
Plant Marsh with Sill.
In moderate energy environments a sill may be required to establish a living shoreline. Remove any existing shoreline structure if present and grade the bank if possible. Stabilize bank with riparian vegetation and plant a marsh with a sill. If the bank cannot be graded, repair existing shoreline structure with a minimal footprint and consider incorporating a marsh with a sill or some other shoreline enhancement (e.g. oyster castles).
Revetment.
Remove existing failing or failed shoreline structure, if present. Construct new revetment as far landward as possible; grade the bank and plant vegetation buffers where possible. If grading is not possible, construct or repair existing revetment in the same alignment. A bulkhead should be considered only if previously present and the site is limited by navigation. Consider shoreline enhancement such as creation of vegetated wetlands and/or riparian buffer and/or sandy beach/dune above and immediately channelward of the structure. In high energy settings where shoreline extends more than 200 feet see option for Offshore Breakwater with Beach Nourishment.
Revetment/Bulkhead Toe Revetment.
If grading is possible, remove the failed bulkhead and replace with a revetment landward of the current bulkhead. When grading not possible, (re)construct bulkhead in the same alignment and/or add a toe revetment. Consider a shoreline enhancement project such as creation of vegetated wetlands and/or riparian buffer and/or sandy beach/dune above and immediately channelward of the structure.

Special Considerations

Ecological Conflicts.
Management options for this shoreline may be limited by the presence of Submerged Aquatic Vegetation (SAV) or Mangroves (Florida and Gulf coast shorelines). For Virginia shorelines, seek advice from the Virginia Marine Resources Commission Habitat Management Division. If you live in another state, seek advice from your local marine regulatory agency.
Highly Modified Area.
Management options for this shoreline may be limited due to the presence of highly developed upland (e.g. commercial wharfs) or infrastructure directly adjacent to the shoreline (e.g. road) and will depend on the need for and limitations posed by navigation access and erosion control. Seek expert advice on the design of your project.
No Action Needed.
No specific actions are suitable for shoreline protection, e.g. boat ramps, undeveloped marsh, and barrier islands.
Special Geomorphic Feature.
Maintain the natural condition of this shoreline to allow for unimpeded sediment movement and the corresponding response of wetlands, beach and/or dune. If primary structures are present and threatened, seek expert advice on the design of your project.

Shoreline & Tidal Marsh Inventory Glossary

Glossary of Shoreline Features

Printable pdf version of Shoreline Inventory Glossary

Agricultural
Land use defined as agricultural includes farm tracts that are cultivated and crop producing. This designation is not applicable for pastureland, which is coded as Grass.
Bank Cover
Bank cover is a classification based on the presence or absence of bare soil on the bank. “Cover” can include either vegetative or structural cover.
Bank Height
Bank height is the height of the bank from the base to the top. We estimate height from imagery, field inspection, videography, LIDAR or a combination of all data sources.
Bare
Land use defined as bare includes areas void of any vegetation or obvious land use. Bare areas include those that have been cleared for construction.
Beaches
Beaches are persistent sandy shores that are visible during high tides. These features can be wide or thin lenses of sand. Beaches are coded as linear features at the wet/dry line to portray their location only. If a beach does not have a visible wet/dry line, then the line feature is located at the seaward edge of the beach. ‘Wide’ beaches have at least 25 feet of dry sand persistently visible above high tides. Beach features coded along tidal marsh shorelines are persistent, sandy features located on the water side of tidal marsh vegetation. Sand washed into tidal marshes is not coded as a beach if the marsh vegetation and/or marsh edge is still clearly visible. This classification of beaches along tidal marsh shorelines can include professional judgment.
Boathouse
A boathouse is considered any covered structure alongside a dock or pier built to cover a boat. They include true “houses” for boats with roof and siding, as well as awnings that offer only overhead protection. Since nearly all boathouses have adjoining piers, piers are not surveyed separately, but are assumed. Boathouses may be difficult to see in aerial photography.
Boat Ramp
Boat ramps are used to launch vessels of all types. They are usually constructed of concrete, but wood and gravel ramps are also found. Point identification of boat ramps does not discriminate based on type, size, material, or quality of the launch. This inventory attempts to distinguish, when possible, private versus public ramps. Ramps located in privately owned, commercial marinas and residential communities are classified as private.
Breakwaters
Breakwaters are structures that sit offshore and generally occur in a parallel series along the shore. Some breakwaters are attached to the land and are referred to as headland breakwaters. Their purpose is to attenuate and deflect incoming wave energy, protecting the fastland behind and between the structures.
The Shoreline Inventory does not map individual breakwaters. A breakwater “system” is delineated and depicted as a line parallel to the series of breakwaters. Breakwaters are distinguished from marsh toe revetments by the size of the structures and presence of a sand beach instead of a tidal marsh landward from the structures. The classification can include best professional judgment.
Bulkhead
Bulkheads are traditionally treated wood or steel “walls” constructed to offer protection from wave attack. More recently, plastics are being used in the construction. Bulkheads are vertical structures built slightly seaward of the problem area and backfilled with suitable fill material. They function like a retaining wall, as they are designed to retain upland soil, and prevent erosion of the bank from impinging waves.
From aerial photography, long stretches of bulkheaded shoreline may be observed as an unnaturally straight or angular coast. They are mapped and illustrated as linear features along the shoreline. In rare cases, the bulkhead may be located well inland from the depicted location because the coding follows a digital shoreline.
Commercial
Commercial is a land use classification denoting small commercial operations such as shops, restaurants, as well as campgrounds. These operations are not necessarily water dependent businesses.
Debris
Debris represents nonconforming materials and rubble dumped along the shoreline in a haphazard manner. Debris can include tires, bricks, broken concrete rubble, and railroad ties as examples. The inventory maps Unconventional instead of Debris when the material is deliberately placed for shoreline protection in a manner similar to riprap, bulkhead, and other shoreline protection structures.
Dilapidated Bulkhead
A bulkhead which has failed due to deterioration from age or storm damage is called a dilapidated bulkhead. In many cases the structure may not be able to perform erosion control functions any longer.
Dilapidated Pier
A pier which has failed due to deterioration from age or storm damage is classified as a dilapidated pier. The remnants of this structure may be original pilings only.
Dock/Pier
In this survey, a dock or pier is a structure, generally constructed of wood, which is built perpendicular or parallel to the shore. These are typical on private property, particularly residential areas. However, there are exceptions where they are used in working waterfront communities, and may be disconnected from the shore. In general docks provide access to the water, a mooring for vessels, and a venue for recreational activities. They are mapped as point features. Pier length is not surveyed.
Forest Land Use
Forest cover includes deciduous, evergreen, and mixed forest stands. The land use is classified as Forest if there is a dense cover of trees and no other land use category is apparent close to the shoreline, e.g. residential, commercial, industrial, agriculture, etc.
Grass
Grasslands include large unmanaged fields, managed grasslands adjacent to large estates, agriculture tracts reserved for pasture, and grazing. While a general rule of thumb will classify a tract as “grass” if a home sits behind a large tract of grass, a designation of “residential” may be made if there are similar tracts adjacent to each other. This designation can be determined using best professional judgment.
Groinfield
Groins are low profile structures that sit perpendicular to the shore. They can be constructed of rock, timber, or concrete. They are frequently set in a series known as a groinfield, which may extend along a stretch of shoreline for some distance. Unless only a single groin can be detected, this inventory does not delineate individual groins in a groinfield. The groinfield is mapped as one linear feature parallel to the shoreline running along the length of the groin series. When effective, groins will trap sediment moving alongshore.
Industrial
Industrial operations are larger commercial businesses and can include areas where power plants, pulp mills, refineries, etc. are in operation along the coast.
Jetty
A jetty is a structure which is perpendicular to the shoreline and generally located near navigation channels and other places associated with navigation, such as the entrance of tidal creeks and tributaries, boat ramps, or marina boat basins. The function of a jetty is to reduce wave action and prevent sediment transported alongshore from accumulating in navigation areas.
Land Use
Land Use refers to the predominant condition in the immediate riparian area within 100 feet of the adjacent shoreline. While the actual assessment of land use is defined by a distance, the classification can include best professional judgment; particularly when development or other land use activity is setback on the parcel.
Marina
Marinas are denoted as line features in this survey. The infrastructure associated with the marina (e.g. bulkheading, docks, wharfs, etc) are not digitized individually. However, if a boat ramp is noted it will be surveyed separately and coded as private. Marinas are generally commercial operations. However, smaller scale community docks offering slips and launches for residences are becoming more popular. To distinguish these facilities from commercial marinas, the user could check the riparian land use delineation. If “residential” the marina is most likely a community facility. The survey estimates the number of slips within the marina and classifies marinas as those with less than 50 slips and those with more than 50 slips.
Marsh
Tidal marsh at least 20 sq.ft. in area, meeting the definition established in Virginia’s Tidal Wetlands Act, and not otherwise considered a marsh island. In all cases, wetland vegetation must be relatively well established, although not necessarily healthy. In previous Tidal Marsh Inventories, marshes were further classified based on morphology and physiographic setting.
Marsh Island
A marsh island is a vegetated wetland that is completely isolated from the mainland and found in open water. A marsh that is surrounded by water due to dissection from small tidal creeks was classified as marsh, not a marsh island.
Marsh toe revetment (aka Marsh sill)
A low revetment placed offshore from an existing marsh or new planted marsh is classified as marsh toe revetment. The structure may include tidal openings to allow for the easy exchange of free swimming organisms during tidal cycles. Marsh toe revetments are mapped as offshore linear features running along the length of the structure. Marsh toe revetments are distinguished from breakwaters by the linear placement and presence of a tidal marsh instead of a sand beach landward from the structure. The classification can include best professional judgment.
Military
A land use classification of Military marks the location of federal military reservations. This classification is generally reserved for the section of the base where active operations and infrastructure exist. Expansive military property adjacent to these areas which are unmanaged forest areas, for example, may be classified as forest land use.
NoMarsh_Forest
Areas of trees found within a tidal marsh that are not considered part of the tidal marsh. May be upland, tidal swamp, or nontidal swamp.
NoMarsh_Sand
Sand overwash on top of marsh. May or may not continue to be marsh in the future. Not counted as marsh for current survey.
NoMarsh_ScrubShrub
Areas of non-wetland scrub-shrub vegetation found within a tidal marsh.
Paved
Paved areas represent roads which run along the shore and generally are located at the top of the banks. Paved also includes parking areas such as parking at boat landings, or commercial facilities.
Phragmites australis
Also known as common reed or reed grass, Phragmites is an invasive wetland plant known to thrive in areas that have experienced disturbance. Phragmites is mapped in two ways as a tidal marsh community type where it is dominant (>50% cover) and also where it appears in mapped tidal marshes in any amount.
Residential
Residential land use includes single and multi-family dwellings located near the shoreline.
Riprap (aka Revetments)
Sloped structures constructed with large, heavy stone or other materials placed against the upland bank for erosion protection are classified as riprap. Riprap is mapped as a linear feature along the shoreline. Riprap is also used next to failing bulkheads (bulkhead toe revetments). The inventory maps only riprap when this type of structure is co-located with bulkheads. A similar structure is used to protect the edge of eroding marshes. This use is mapped as marsh toe revetment, not riprap.
Scrub-shrub
Scrub-shrub is a land use class that includes small trees, shrubs, and bushy plants. This land use is easily distinguished during remote sensing compared to Forest and Grass.
Shoreline
generalized term for the land-water interface. Also see Upland Shoreline.
Spit
A narrow coastal landform tied to the upland shoreline at one end resulting from the deposition of sand moved by tides and currents. Spit features are generally sandy and may be dominated by beach, dune, and/or marsh habitats. For inventory purposes, this definition does not include spit features that are developed or have developable upland.
Timbered
Timbered or clear-cut land use is an area where all the trees have been cut down or removed for harvesting or in preparation for construction.
Tree Fringe
When the dominant riparian land use is not Forest but a line of trees is maintained along the bank edge, the land use is noted to include a tree fringe. When the tree fringe is between 100 and 500 feet it is considered a wide tree fringe. When the tree fringe is greater than 500 feet, it would be labled "forested" in land use.
Unconventional
Unconventional features represent segments along the shore where alternative material has been deliberately placed for shoreline protection. Unconventional features may include unique materials placed in a similar manner as riprap or bulkheads, such as engineered pre-cast concrete products. It may also include unique placement or arrangement of conventional materials like riprap that does not fit other structure definitions. The inventory maps Debris instead of Unconventional when the material is haphazardly scattered and not providing any shoreline protection value.
Upland Shoreline
the boundary between the water and upland. Where marshes exist, it is the upland edge of the tidal marsh, or where beaches exist, the upland edge of the beach. Also referred to as the baseline shoreline, it is not a tidally referenced or surveyed demarcation. It is the baseline on which the lubc (land use and bank condition) is coded.
Wharf
Typically describes a shore parallel structure where boats are tied. In this inventory, Wharf is generally associated with large industrial, public or commercial facilities.
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Map Contents
Shoreline Condition Layers:

Preferred Shoreline BMPs:
(Layers display at a scale of 1:300,000 and below)
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Sea Level Rise:

Other Layers:

Virginia Imagery(VGIN):
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Center for Coastal Resources Management, Virginia Institute of Marine Science, Gloucester Point, Virginia |
6km
4mi