CERKNICA LAKE:

Lake Cerknica is one of the largest intermittent lakes in Europe. It appears every year on the karst polje, caught between the Javorniki hills and the Bloke plateau on one side, and Mount Slivnica on the other. During the dry season, the lake disappears, which enables paddling, fishing, hiking  in the same area in just one year.

www.notranjski-park.si/en/nature/natural-sights/lake-cerknica