The arid and semi-arid areas of New South Wales are commonly referred to as 'rangelands'. These lands generally lie to the west of the 500 mm average rainfall limit. The main enterprise is extensive grazing of predominantly native pastures. On the eastern and southern margins of the rangelands, extensive grazing occurs in conjunction with broadacre cropping and areas of intensive irrigated agriculture. Collectively, the semi-arid and arid zones occupy about 60 per cent of the State.