Tag:sinkhole=bluehole
| sinkhole = bluehole | 
| Description | 
|---|
| A vertical, underwater sinkhole, named after the deep blue color they mainly show. | 
| Group: Natural | 
| Used on these elements | 
| Requires | 
| Useful combination | 
| Status: approved | 
| Tools for this tag | 
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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=bluehole name=Great Blue Hole depth=124
See also
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