Little River County is a county located on the southwest border of the U.S. state of Arkansas, bordering a corner with Texas and Oklahoma. As of the 2020 census, the population was 12,026. The county seat is Ashdown.

The Texarkana metropolitan statistical area (MSA), as defined by the United States Office of Management and Budget, is a two-county region anchored by the twin cities of Texarkana, Texas and Texarkana, Arkansas, and encompassing surrounding communities in Bowie County, Texas, and Miller County, Arkansas. As of the 2016 census, the MSA had a population of 150,098. Texarkana is a subset of the broader Ark-La-Tex region.