Riders mustering cattle as part of the Great Australian Outback Cattle Drive in South Australia. The drive is held in Anna Creek Station, the world's largest cattle property, which has been put up for sale. The 11 million ha area, the size of Belgium, comprises 10 properties in Australia's Outback and has been held by the owning family for over 100 years. It is expected to fetch about US$248 million (S$335 million).