The Jenolan Caves are limestone caves located within the Jenolan Karst Conservation Reserve in the Central Tablelands region, west of the Blue Mountains, in New South Wales, in eastern Australia. The caves and 3,083-hectare reserve are situated approximately 175 kilometres west of Sydney, 20 kilometres east of Oberon and 30 kilometres west of Katoomba.
The caves are the most visited of several similar groups in the limestone caves of the country, and the most ancient 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 follows the course of a subterranean section of the Jenolan River. It has more than 40 kilometres of multi-level passages and over 300 entrances. The complex is still being explored. The caves are a tourist destination, with eleven illuminated show caves open to paying visitors.
The caves and conservation reserve are one of the eight protected areas that was inscribed in 2000 to form part of the UNESCO World Heritage-listed Greater Blue Mountains Area.