Poached Egg wildflowers at Lake Mungo National Park. Dunes on the west of the huge lunette on the western shore of Lake Mungo. The lunette is made up of sand dunes and eroded pinnacles known as The Walls of China. Afternoon view. Lake Mungo National Park is a part of the Willandra Lakes World Heritage Area, a chain of dried out lakes that were once strung between Willandra Creek and the main channel of the Lachlan River in Outback NSW. Lake Mungo dried up around 14,000 years ago. New South Wales, Australia. Canon 500D, zoom lens.