The bizarre and beautiful rock formations of what are called the Bungle Bungles in the Purnululu National Park in the remote Kimberley region of western Australia were formed by an ancient river. The geological explanation for the unique orange and black coloured rocks is the differing levels of clay in layers of sandstone. More clay meant the formation of algae that coloured the rock black while less clay meant less algae and a patina of iron oxide that coloured the rock orange. A land rover car drives along the red roads in the park.