The Murray-Darling catchment covers more than 1 million km2and drains 14% of the Australian continent. It extends across the borders of four states (New South Wales, Queensland, Victoria and South Australia) and one territory (Australian Capital Territory) in the southeast of Australia (Figure 1).
This is Australia’s most important foodproducing region. It generates 40% of the national income derived from agricultural production (approximately £20 billion). It produces over half of Australia’s cereals grown for grain (including all the nation’s rice), nearly all its oranges, and over half its apples. The basin also supports over a quarter of the nation’s cattle herd and half its sheep.
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