The Kiamichi Mountains are a mountain range in southeastern Oklahoma. A subrange within the larger Ouachita Mountains that extend from Oklahoma to western Arkansas, the Kiamichi Mountains sit within Le Flore, Pushmataha and McCurtain counties near the towns of Poteau, Albion and Smithville. The foothills of the Kiamichi Mountains sit within Haskell County, Northern Latimer County and Northern Pittsburg County. Its peaks, which line up south of the Kiamichi River, reach 2,500 feet in elevation. The range was the namesake of Kiamichi Country, the official tourism designation for southeastern Oklahoma, until the designation was changed to Choctaw Country.

LeFlore County is a county along the eastern border of the U.S state of Oklahoma. As of the 2020 census, the population was 48,129. Its county seat is Poteau. The county is part of the Fort Smith metropolitan area and the name honors a Choctaw family named LeFlore. The United States District Court for the Eastern District of Oklahoma is the federal district court with jurisdiction in LeFlore County.