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The Warragamba River, a Perennial stream that is part of the Hawkesbury River-Nepean River catchment, is located in the Macarthur region of New South Wales, Australia.
Prior to the creation of Lake Burragorang, the Warragamba River would have been formed by the confluences of the Coxs, Nattai River, and Wollondilly rivers in the Burragorang Valley. Downstream, the river flowed through a gorge that varied in width from to , and was in depth. It was this configuration which allowed a relatively short but high dam wall in the gorge to impound a large quantity of water.
Today, the Burragorang Valley and most of the Warragamba River is submerged beneath the lake, and the remaining section of the river flows only the north-east from the Warragamba Dam spillway to its confluence with the Nepean River.
The area surrounding Warragamba River is managed by Sydney Catchment Authority under the that defines special zones and places restrictions and controls on land use, development and access in order to safeguard potable water.
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