Southwestern Oklahoma

Southwest Oklahoma is a geographical name for the southwest portion of the state of Oklahoma, typically considered to be south of the Canadian River, extending eastward from the Texas border to a line roughly from Weatherford, to Anadarko, to Duncan. Geologically, the region is defined by a failed continental rift known as the Southern Oklahoma Aulacogen. The austere nature of the prairie landscape with intermittent island ranges has made it a favorable place for artists and photographers alike.

Anchored by Lawton, its largest city, Southwest Oklahoma's other important urban centers include Elk City, Clinton, Weatherford, Walters, Altus, and Duncan.

One section of the 1890 Organic Act established that a lawsuit should be filed to clarify the boundary between Oklahoma and Texas. The U.S. Supreme Court ruled in 1896 that what had been considered part of Texas would now be part of Oklahoma Territory. The area makes up the southwestern corner of Oklahoma and today consists of Beckham County, Harmon County, Jackson County, and Greer County.

Another portion of Southwestern Oklahoma was opened up through the Land Run of 1892. Land formerly owned by the Cheyenne and Arapaho tribes became Oklahoma Territory and today includes Blaine County, Dewey County, Custer County, and Roger Mills County and Washita County.

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