Matamoros–Brownsville, also known as Brownsville–Matamoros, or simply as the Borderplex, is one of the six bi-national metropolitan areas along the Mexico–U.S border. The city of Matamoros is situated on the Mexican state of Tamaulipas, on the southern bank of the Rio Grande, while the city of Brownsville is located in the American state of Texas, directly north across the bank of the Rio Grande. The Matamoros–Brownsville is connected by four international bridges. In addition, this transnational conurbation area has a population of 1,136,995, making it the 4th largest metropolitan area in the Mexico-US border.