|Location||Nullarbor Plain, South Australia|
Thousands of square metres in the cave are covered in parallel finger-marked geometric lines and patterns, Indigenous Australian artwork which has been dated as 20,000 years old, making it older than any known prehistoric art in Europe. It is located about 97 kilometres (60 mi) north east from Eucla within the Nullarbor Wilderness Protection Area.
The cave was explored by an expedition led by Captain J. M. Thompson in 1935. The team entered the cave by a ladder and found themselves in a chamber some 244 metres (800 ft) in circumference and walked down tunnels over 366 metres (1,200 ft) in length.
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- "Koonalda", Minnesota State University
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- "Caves and Lakes.". The Sydney Morning Herald. National Library of Australia. 20 November 1935. p. 12. Retrieved 6 June 2014.
- "Protected Areas of South Australia September (Map) 2014 Edition" (PDF). Department of Environment, Water and Natural Resources. Retrieved 15 April 2015.
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- "National Heritage Places – Koonalda Cave". Department of the Environment (Australia). Retrieved 6 May 2015.
- "Koonalda Cave, Nullarbor National Park [also on the National Heritage List ID 106022]". South Australian Heritage Register. Department of Environment, Water and Natural Resources. Retrieved 12 February 2016.