The Murray-Darling River System: Entirely Within Australia

The Murray-Darling Basin is Australia's largest and most important river system—and it flows through no other country. The Murray River (2,508 km) and Darling River (1,472 km) and their tributaries drain 1,058,800 km² (14% of Australia's landmass) across four states and one territory:

• New South Wales (upper Murray, Murrumbidgee, Darling)
• Victoria (upper Murray, Goulburn, Campaspe, Loddon)
• Queensland (upper Darling tributaries: Condamine, Balonne, Warrego)
• South Australia (lower Murray, lakes, Coorong)
• Australian Capital Territory (small headwater catchments)

Key Features

• Murray River rises in the Australian Alps, forms NSW-Vic border, enters SA, flows to Southern Ocean at Murray Mouth.
• Darling River rises in Queensland's Darling Downs, flows southwest through NSW, joins Murray at Wentworth.
• Major tributaries: Murrumbidgee, Goulburn, Lachlan, Warrego, Paroo.
• Terminal lakes: Lake Alexandrina, Lake Albert, Coorong lagoon.

Significance and Stresses

The basin produces 40% of Australia's agricultural output ($24B/year), supports 2.3 million people, and holds immense cultural value for 40+ First Nations. But overallocation, drought, climate change, and salinity threaten its health. The Murray-Darling Basin Plan (2012) seeks sustainable diversion limits.

Entirely Australian, the Murray-Darling is a national lifeline—its management a test of the continent's water future.