Open Ceiling Cave
Collapsed sea cave – a circular sea basin that is connected to the sea with a large cave – natural arch that is some 13 m wide. Sea waves enter this cave. In the middle of this basin stands small island – remnants of the fallen cave ceiling.
Maingon Blowhole
Some 40 m deep, narrow sinkhole – a collapse of a sea cave. It is dangerous to attempt to see its bottom but the waves can be heard from it.
Port Campbell Blowhole
A sinkhole – collapse in the roof of sea cave in the spectacular Loch Ard. It is possible that for a while here existed a blowhole with fountain but currently this is a sinkhole with raging sea-water seen in it. This blowhole is loud.
Jacks Blowhole
Spectacular sinkhole – a large opening in the ground that formed after the sea cave collapse. The sinkhole is some 55 m deep and some 200 m from the sea. It is filled with roaring, raving waves.
Little Salt Spring
Water filled, 61 m deep sinkhole. At the depth of 3 m, the water becomes anoxic. Thanks to this in the sinkhole – spring have been preserved numerous examples of prehistoric fauna and remnants of Palaeo-Indians: hundreds of burials from 4,800 – 3,200 BC.
Lake Jackson
Shallow, 12 km long lake with two sinkholes in it. This lake has disappeared underground four times since 1907.
Falling Waters Sink
35 m deep and 6.5 m wide sinkhole. In wet season a stream falls in the sinkhole forming a 22 m high waterfall – the highest in Florida.
Devil’s Den in Florida
A karst window: here through a narrow opening opens a view of a large subterranean river. Here were found remains of animals and traces of prehistoric human activities.
Beacon Woods – Wayne’s World System
Long underwater cave system under a built-up area. The total length of explored passages is 18,289 m.
Baboquivari Cave
Sacred cave of Tohono O’Odham people, center of their cosmology. According to their beliefs here lives I’itoi – protector of the people. Nearby are petroglyphs.