The Shoalhaven River is a barrier river estuary with an open entrance. The estuary is large and flows from a freshwater river into the sea (the Shoalhaven Bight) between Bomaderry and Nowra. Thirty-four tributary streams flow into the river as it flows through the catchment, such as the Mongarlowe and Kangaroo Rivers.
Shoalhaven River is situated in the Southern Rivers district of New South Wales. It is a wave dominated barrier estuary with an open entrance.