Chillagoe-Mungana Caves.

Photograph by Drew Hopper
A limestone karst in Chillagoe-Mungana Caves National Park, Queensland.
Karst topography is a landscape formed from the dissolution of soluble rocks such as limestone, dolomite, and gypsum.
It is characterized by underground drainage systems with sinkholes and caves.
It has also been documented for weathering-resistant rocks, such as quartzite, given the right conditions. Subterranean drainage may limit surface water with few to no rivers or lakes.
However, in regions where the dissolved bedrock is covered (perhaps by debris) or confined by one or more superimposed non-soluble rock strata, distinctive karst surface developments might be totally missing.
Source: WALLPAPER: Illuminated limestone – Australian Geographic

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