There is a massive escarpment in Arnhem Land that divides most of Arnhem Land up on the plateau from the smaller coastal part. Jim Jim Falls and Twin Falls are examples of water flowing off the escarpment in Kakadu National Park. It is rarely shown.

During my helicopter trip over Arnhem Land and Kakadu I flew along the escarpment. Here are some images, the escapement is HUGE (especially in a helicopter about 100m away.)