About Cocklebiddy Cave
Cocklebiddy Cave is a large limestone cave system on the Nullarbor Plain in the Shire of Dundas, Western Australia, near Cocklebiddy Roadhouse on the Eyre Highway. It is one of Australia's longest cave systems, known for its extensive passages, massive chambers and a large permanent underground lake. Formed in the Nullarbor karst, it is significant for speleology and requires permits and specialist caving experience for access, and is not developed for general tourism.
Visitors guide
Visitors can expect a remote, undeveloped limestone cave on the Nullarbor Plain accessed via unsealed 4WD tracks north of the Eyre Highway. The cave features very large passages and chambers and a deep permanent underground lake. There are no developed paths, lighting, or visitor facilities. Access is restricted to experienced cavers and cave divers with a permit; casual sightseeing inside the cave is not permitted and entry requires specialist equipment and preparation.
Key highlights
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One of the longest and largest cave systems on the Nullarbor Plain
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Massive passages and chambers formed in Nullarbor limestone karst
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Large permanent underground lake requiring cave diving to fully explore
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Significant site for Australian speleology and cave exploration history
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Remote Nullarbor Plain setting near the Great Australian Bight
History of Cocklebiddy Cave
Cocklebiddy Cave is part of the extensive Nullarbor karst system formed over millions of years in limestone. It became notable in speleological history after systematic exploration from the mid-20th century, with major cave-diving expeditions in 1983 that mapped extensive submerged passages and the large underground lake, establishing it as one of Australia's most significant cave systems.
Route
| By road | Via Eyre Highway to Cocklebiddy Roadhouse, then north on unsealed 4WD tracks to the cave entrance; high-clearance 4WD required, permit required, tracks can be rough and impassable after rain |
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