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Public-images-osm logo.svg sinkhole = estavelle
Estavelle-Trou des glanes.JPG
Sinkhole through which water either emerges or disappears, depending on hydrological conditions Edit or translate this description.
Group: Natural
Used on these elements
may be used on nodesshould not be used on waysshould not be used on areasshould not be used on relations


Useful combination


Status: approvedPage for proposal


An  estavelle is a sinkhole, typically connected to a waterbody, which can act as a ponor or as a karst spring, depending on hydrological conditions:

  • if the groundwater level inside the karst system rises, the estavelle acts as a discharge, allowing the karst water to flow out forming a surface waterway
  • on the contrary, with falling water levels, the estavelle acts as a ponor, swallowing surface water and draining it to the karst groundwater system.

An estavelle may be on the path of a waterway, or connected to a main waterway by a small one, whose flow will change according to the respective water levels of the karst system and of the waterway; if in the second case, use flow_direction=both to highlight the flow variations of the connecting waterway.


The Trou des Glanes, an estavelle in France, would be tagged this way:

name:fr=Trou des Glanes

See also