Western Greer County lies in the Gypsum Hills, while the eastern one-third is in the Red Bed Plains physiographic region. The county is drained by the North Fork Red River, Elm Fork Red River, and Salt Fork Red River.
Western Greer County lies in the Gypsum Hills, while the easter,n one-third is in the Red Bed Plains physiographic region The county is drained by the North Fork Red River, Elm Fork Red River and Salt Fork Red River.