![Lake Hart in South Australia.](http://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Lake_Hart.jpg/250px-Lake_Hart.jpg)
The Lake Eyre Basin has a drainage basin that covers one-sixth of all Australia. It is one of the largest internal drainage systems in the world, and covers roughly 1.2 million square kilometres, including much of inland Queensland, large portions of South Australia and the Northern Territory, and a part of western New South Wales.