These are the sand dunes on the way to the Pinnacles Desert in Nambung National Park.
The Pinnacles, formed thousands of years ago when ancient plant roots formed a weak cementation of calcite within the dunes and have been exposed by wind and shifting sands.
The Pinnacles have been sculpted by acidic ground water beneath the dunes. Once the Pinnacles are exposed by the shifting sands they are further sculpted by wind, rain and sun. Could not resist this phallic structure.
Limestone caves further inland near Lake Indoon and Leeman.
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