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Ponor
Videos
A ponor is a natural opening where surface water enters into underground passages; they may be found in karst landscapes where the geology and the geomorphology is typically dominated by porous limest
The river Dobra enters a 17 km long cave system at Đulin ponor [hr] in Ogulin, Croatia.
The river Dobra enters a 17 km long cave system at Đulin ponor [hr] in Ogulin, Croatia.
One of few ponors of the Rak River, Slovenia
One of few ponors of the Rak River, Slovenia
Polje of Feneos, Greece, lake until late 19. Century. Rain showers flood large parts even today
Polje of Feneos, Greece, lake until late 19. Century. Rain showers flood large parts even today
Closeup of ponor in Câmpeneasca cave near Izbuc village, Romania
Closeup of ponor in Câmpeneasca cave near Izbuc village, Romania
Sinkhole
Videos
A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are also known as shakeh
Ponor
…Herzegovina, Croatia, Czech Republic, Hungary, Romania, Montenegro, Serbia, and Slovenia) bear the name Ponor due to associated karst openings. Whereas a sinkhole (doline) is a depression of surface topography with a pit or cavity directly underneath, a ponor is kind of a portal where a surface stream or lake…
The Red Lake sinkhole in Croatia
The Red Lake sinkhole in Croatia
Sinkholes near the Dead Sea, formed when underground salt is dissolved by freshwater intrusion, due to continuing sea-level drop.
Sinkholes near the Dead Sea, formed when underground salt is dissolved by freshwater intrusion, due to continuing sea-level drop.
Collapse sinkhole in Chinchón, Spain.
Collapse sinkhole in Chinchón, Spain.
A 32-foot-deep (9.8-meter) collapse formed by rainwater leaking through pavement and carrying soil into a ruptured sewer pipe in the parking lot at Ge
A 32-foot-deep (9.8-meter) collapse formed by rainwater leaking through pavement and carrying soil into a ruptured sewer pipe in the parking lot at Georgia Tech in Atlanta, Georgia in 2005