A ponor where the Reka River disappears into Škocjan Caves, Slovenia Collecting basin, stone rake, ponor (behind viewer), Peloponnese A Stubai Alps stream terminates in a ponor A fenced-in ponor south of Grosuplje, Slovenia Closeup of ponor in Câmpeneasca cave near Izbuc village, Romania The Risle River disappears into a ponor between Ajou and La Houssaye (Eure, France)