Estavelle
Karst ground orifice which is sometimes a sink and other times a source
![](http://upload.wikimedia.org/wikipedia/commons/thumb/0/01/Creux_Genat%2C_2.4.2005_und_17.4.2006.jpg/220px-Creux_Genat%2C_2.4.2005_und_17.4.2006.jpg)
In karst geology, estavelle or inversac is a ground orifice which, depending on weather conditions and season, can serve either as a sink or as a source of fresh water. It is a type of ponor or sinkhole.[1][2]
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