Gillham Lake, the "Bright Spot on the Cossatot," is formed by the clear water of the Cossatot River in southwest Arkansas. The 8,600 acre lake has approximately 36 miles of shoreline. Gillham Lake has 5 recreation areas around the lake. There are 5 boat ramps, 3 campgrounds, 1 picnic shelter, and 1 designated swim area.