Texas borders New Mexico on the west, Oklahoma on the north (across the Red River), and Louisiana (across the Sabine River) and Arkansas on the east. To the southwest, across the Rio Grande, Texas borders the Mexican states of Chihuahua, Coahuila, Nuevo León, and Tamaulipas. To the southeast of Texas lies the Gulf of Mexico.
Texas lies in the south-central part of the United States of America. Texas is considered to form part of the US South and part of the U.S. Southwest. Some regions of Texas are associated with the Southwest more than the South, while other regions are associated with the South more than the Southwest. Texas shares some cultural elements with both regions, with more similarities with the South, especially Arkansas and Louisiana, in East Texas, and more similarities with the Southwest, especially Mexico and New Mexico, in West Texas and South Texas.