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 60 miles (97 km) north east from Eucla within the Nullarbor National Park.
The cave was explored by an expedition lead by Captain J. M. Thompson in 1935. The team entered the cave by a ladder and found themselves in a chamber some 800 feet (244 m) in circumference and walked down tunnels over 1,200 feet (366 m) in length.
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- "Koonalda", Minnesota State University
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- "Caves and Lakes.". The Sydney Morning Herald (New South Wales: National Library of Australia). 20 November 1935. p. 12. Retrieved 6 June 2014.
- "Secrets of Koonalda Caves". South Australian Museum. 2014. Retrieved 6 June 2014.