The landscape of Australia is ever changing and with Mungo National Park, those changes can be dated as far back as 32 million years ago. It was around this time that the ocean flooded the Murrary Darling Basin, turning south-western NSW into an inland sea. After 25million years, the ocean retreated but water levels in the area continued to fluctuate as surrounding river systems flooded. By 150,000 years ago, Lake Mungo and the surrounding Willandra Lakes had been established.
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