Connells Lagoon Conservation Reserve is situated in the heart of the Barkly Tableland. It is the only Reserve in Australia established primarily for the conservation of Mitchell Grassland communities.

Situated north-east of the Barkly Homestead, on the eastern boundary of Brunette Downs Station, it covers an area of approximately 256 square kilometres.

The landscape is extremely flat, broken only by shallow watercourses in the north and occasional, barely perceptible gravelly rises.