Tag:natural=shoal

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Public-images-osm logo.svg natural = shoal
SandbarLongIsland1.jpg
Description
An area of the sea floor which nears the sea surface and is exposed at low tide. Edit or translate this description.
Group: Marine
Used on these elements
should not be used on nodesshould not be used on waysmay be used on areasshould not be used on relations
Useful combination
Wikidata
Status: de factoPage for proposal

The natural=shoal tag is used to mark an area of the sea floor which nears the sea surface (literally, becomes shallow) and is exposed at low tide. This tag is used for distinct raised features like sand or gravel bars but not for tidal flats, i.e. larger flat tidal areas.

How to map

ElementArea.png

To map a shoal you can just draw a line closing on itself, marking the area area of the shoal and tag it natural=shoal. To map larger shoals you can use Relation:multipolygon with the same tag.

If known you can add the following tags:

Mapping caveats

This tag should not be used for:

  • features that are permanently below water - use natural=reef for that.
  • features that are permanently above water - use place=island or place=islet for that.
  • for the lower part of beaches lying below the water level - these should be part of a natural=beach.
  • tidal flats, i.e. flat areas exposed at low tide but water covered at high tide - use natural=wetland + wetland=tidalflat instead.

Example rendering

Rendering-area-beach.png Rendering-area-beach-gravel.png
natural=shoal + surface=sand natural=shoal + surface=gravel

See also

  • subsea=* for another tagging approach