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|natural = reef|
|A feature (rock, sandbar, coral, etc) lying permanently beneath the surface of the water.|
|Rendering in OSM Carto|
|Used on these elements|
|Status: de facto|
|Tools for this tag|
Ais a rock, sandbar or other feature (such as coral, stromatolites...) that lies permanently beneath the surface of the water but close to the surface (permanently means at low tide for the seas).
However note that small parts of reefs may be exposed at low tide, but not the entire feature. Reefs are never exposed at high tide.
How to map
This tag should not be used for:
- features that rise permanently above the water - use place=island/islet instead and add the type of soil/vegetation if you know it (sand, bare_rock, scrub...). If the area is in a sea, don't forget to add natural=coastline (not needed for a inland piece of water).
- features exposed at low tide but water covered at high tide - use the more appropriate tags between natural=shoal or natural=sand + tidal=yes (if the area is sand or gravel like for the lower part of beaches lying below the water level at high tide), natural=bare_rock/rock + tidal=yes (for rocks) and natural=wetland + wetland=tidalflat (for tidal flats, i.e. muddy areas, see on Wikipedia).
- natural=shoal for shoals that lie above the surface of the water at low tide
- natural=beach for beaches
- natural=wetland + wetland=tidalflat for muddy areas
- Overpass Query to display reefs on the map. Zoom to the area you need and press Run in the top left corner.
- subsea=*, alternative tagging
Possible tagging mistakes