Jenolan Caves are caves in the Blue Mountains, New South Wales, Australia; 175 kilometres west of Sydney. They are the most visited of several similar groups in the limestone of the country, and the oldest discovered open caves in the world.
They include numerous Silurian marine fossils and the calcite formations, sometimes pure white, are noted for their beauty. The cave network is very large, with over 40 km of multi-level passages, and the complex is still undergoing active exploration. The caves are a popular tourist destination, with several kilometres of the caves rendered accessible to paying visitors and well lit.
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