The Murray River is the longest river in Australia at 2520km, combining with the Darling and Upper Darling Rivers to form the Murray-Darling basin. The Murray Darling extends over 15% of the continent, and serving 4 States and the ACT with water. The Murray also supports about 1/3 of Australia's agricultural production, supports 50% of Australia's sheep and croplands, and 25% of beef and dairy herds, contains about 62% of the country's irrigated land and supplies 50% of South Australia's water.