In Perth, the Noongar believe that the Darling Scarp is said to represent the body of a Wagyl, a snakelike being from the Dreamtime that meandered over the land creating rivers, waterways and lakes. It is thought that the Wagyl created the Swan River. The Wagyl has been associated with Wonambi naracoutensis, part of the extinct megafauna of Australia that disappeared between 15 and 50,000 years ago.