The major river systems of the Northern Agricultural Region form a part of the four drainage basins: Murchison, Greenough, Moore – Hill and Yarra-Yarra.   The rivers only flow after substantial rainfall and the lower reaches of the rivers are open to the ocean during high winter flows.  The lower reaches of the rivers comprise of estuaries, which provide important habitat and refuge areas for many aquatic organisms, fringing vegetation and associated fauna.

There are a number of river systems that are recognised for their significant ecological values including the Greenough, Chapman, Hill and Moore river estuaries, which are significant migratory bird feeding areas.

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Data sourced from the Department of Water and Landgate SLIP.