 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.