Tag:sinkhole=bluehole

sinkhole = 
Description
A vertical, underwater sinkhole, named after the deep blue colour they mainly show. Show/edit corresponding data item.
Group: natural
Used on these elements
may be used on nodesshould not be used on waysmay be used on areas (and multipolygon relations)should not be used on relations (except multipolygon relations)
Requires

natural=sinkhole

Useful combination
Status: approvedPage for proposal
More details at taginfo
Tools for this tag

A bluehole is a vertical, underwater sinkhole, named after the deep blue color they mainly show. It is typically an area outside natural=coastline, but can be a node if too small to be mapped as an area.

When used on an area, this does not need to be an inner polygon in a multipolygon relation, or otherwise disconnected or excluded of the surrounding waters, as it is included in them, owing to its nature.

Example

The Great Blue Hole, a bluehole in Belize, would be an area tagged this way: 

natural=sinkhole
sinkhole=
name=Great Blue Hole
depth=124

See also

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