|natural = sinkhole|
|A natural depression or hole in the surface topography|
|Used on these elements|
|Tools for this tag|
A crater. Sinkholes are abundant on plateaus., also known as a sink, shake hole, snake hole, swallow hole, swallet, doline, or cenote, is a natural depression or hole in the surface topography caused by the removal of soil or bedrock, often both, by water and/or by collapse of an underlying cavity. A typical form of a sinkhole is a
Don't mix this up with a natural=cave_entrance. On the bottom of a sinkhole, however, there may be a cave entrance. In this case, you may wish to map both, if the sinkhole is of remarkable size; or the cave entrance only, otherwise., which is much larger, or with a
Sinkholes vary in size from 1 to 600 m (3.3 to 2,000 ft) both in diameter and depth, and vary in form from soil-lined bowls to bedrock-edged chasms.
This tag can be specified using sinkhole=*, to precise the type of sinkhole; for OSM, used with anthropogenic=yes, natural=sinkhole and sinkhole=* can describe an anthropogenic sinkhole-like orifice, a cave-in for instance. Remember that natural=* doesn't necessarily designate natural features.
- natural=cave_entrance - for the entrance to an underground cave, often found associated with sinkholes.
- natural=cliff - to map vertical or near-vertical rock faces, including the edges of some sinkholes.
- natural=blowhole - an opening to a sea cave which has grown landwards resulting in blasts of water from the opening due to the wave action.
- man_made=mineshaft - man-made vertical mine entrance
- Proposed features/natural=cave - detailed mapping of caves