The Coolumbooka River, a perennial river of the Snowy River catchment, is located in the Monaro region of New South Wales, Australia.

Course and features

The Coolumbooka River is formed by the confluence of the Badgerys Creek and the Horseys Swamp Creek in a swampy area, located approximately 10 km east northeast of the village of Cathcart. The river flows generally west southwest, joined by one minor tributary before reaching its confluence with the Bombala River near the town of Bombala. The river descends 105 m over its 26 km course, flowing through the northern boundary of the Coolumbooka Nature Reserve. The river is impounded by Coolumbooka Weir that provides water supply to the town of Bombala.