The Devil's Marbles or Karlu Karlu, as they are known by the local Warumungu Aboriginals, are a collection of massive granite boulders strewn across a shallow valley, south of Tennant Creek in the Northern Territory, Australia. They are one of the most widely recognized symbols of Australia's outback.
Formed by erosion over millions of years, the Devil's Marbles are made of granite. Some of the boulders are naturally but precariously balanced atop one another or on larger rock formations, while others have been split cleanly down the middle. Although they appear to have been carefully placed, these boulders actually formed on the ground they stand by erosion of rock that reached the surface from below.
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