Estavelle Explained

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]}

Notes and References

1. Web site: Karstgeology: Estavelle . www.showcaves.com . 24 April 2020.
2. Book: Milanovic . Petar . Water Resources Engineering in Karst . 211–212 . 2004 . CRC Press . 978-0-203-49944-3 . 24 April 2020 . en.