Estavelle
Sign in to savethumb|Creux-Genat, an intermittent karst estavelle between Chevenez and Porrentruy in the Ajoie, recorded on April 2nd, 2005 and April 17th, 2006. 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.
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thumb|Creux-Genat, an intermittent karst estavelle between Chevenez and Porrentruy in the Ajoie, recorded on April 2nd, 2005 and April 17th, 2006. 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.
==References==
Excerpted from Wikipedia’s “Estavelle” article, available under the CC BY-SA 4.0 licence.