Reynosa–McAllen, also known as McAllen–Reynosa, or simply as Borderplex, is one of the six bi-national metropolitan areas along the Mexico–U.S border. The city of Reynosa is situated on the Mexican state of Tamaulipas, on the southern bank of the Rio Grande, while the city of McAllen is located in the American state of Texas, directly north across the bank of the Rio Grande. This metropolitan area has a population of roughly 1,500,000, making it the largest and most populous in the state of Tamaulipas, and third most populous in the U.S–Mexico border.