Texas shares a border with Mexico.
The states of Mexico are first-level administrative territorial entities of the country of Mexico , which officially is named United Mexican States . Texas ( [ ˈtɛksəs ] , [ localˈtɛksᵻz ] Texas or Tejas [ ˈtexas ] ) is the second largest state in the United States by both area and population . Geographically located in the South Central region of the country , Texas shares borders with the U.S. states of Louisiana to the east , Arkansas to the northeast , Oklahoma to the north , New Mexico to the west , and the Mexican states of Chihuahua , Coahuila , Nuevo León , and Tamaulipas to the southwest , while the Gulf of Mexico is to the southeast .