Estavelle

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 sinkhole.

References

"Estavelle".
Petar T. Milanović (2004). Water resources engineering in karst. CRC Press. pp. 211–212. ISBN 978-1-56670-671-1.

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