[2] The Parwan Valley lies between the Brisbane Ranges, Werribee Gorge State Park and the You Yangs.

By 1948 it was estimated that erosion in the valley had reduced the holding capacity of the nearby Melton Reservoir by 20%.

The Victorian Government compulsorily acquired the land and has been attempting to rescue the valley ever since.

At the center of the valley is White Elephant Ridge, which demonstrates the effects of soil erosion.

250 million years ago after the sea receded volcanic activity caused the valley to fault and drop down leaving two large escarpments on either side.