Boybuloq Cave
The cave is the deepest known cave in Asia having been explored to a depth of from the entrance. At the lowest discovered level a water-filled siphon blocks further exploration. It is thought that the cave has the potential to be the deepest known cave in the world, with a theorised depth of making it deeper than the Veryovkina Cave. The explored length of the cave is .
Cades Cove
The fracturing and weathering of the limestone and sandstone in Cades Cove has led to the formation of several caves in the vicinity, the two largest of which are Gregory's Cave and Bull Cave. Bull Cave, at 924 feet (281 m), is the deepest cave in Tennessee. Trilobite and brachiopod fossils have been found in Gregory's Cave.