South Central Oklahoma is an amorphous region in the state of Oklahoma, perhaps encompassing 10 counties. It is centered on the Arbuckle Mountains, an ancient, eroded range traversing some across the region, and surrounded by rivers and lakes, notably Lake Texoma, Lake Murray and Lake of the Arbuckles. For tourism purposes, the Oklahoma Department of Tourism has more narrowly defined South Central Oklahoma, which they refer to as Chickasaw Country, as being a seven-county region including Pontotoc, Johnston, Marshall, Garvin, Murray, Carter, and Love counties. A ten-county definition might also include Coal, Atoka, and Bryan counties, although the Department of Tourism includes those in Choctaw Country. The Choctaw Nation of Oklahoma covers the eastern third of the region. Its headquarters is in Durant, and its capitol building, now a museum, is in Tuskahoma. The Chickasaw Nation lies within the region, with the tribal capitol building located at Tishomingo and its headquarters in Ada. The Chickasaw Nation, which runs , promotes the idea of Chickasaw Country as the 13 south-central Oklahoma counties that comprise the Chickasaw Nation, being the Tourism Department’s seven counties plus Coal, Bryan, Jefferson, Stephens, Grady, and McClain counties.