Matamoros, officially known as Heroica Matamoros and formerly named San Juan de los Esteros Hermosos, is a city in the northeastern Mexican state of Tamaulipas. It is located on the southern bank of the Rio Grande, directly across the border from Brownsville, Texas, in the United States. Matamoros is the second largest and second most populous city in the state of Tamaulipas. As of 2010, Matamoros has a population of 489,193. If its floating population is included in the census count, however, the population of Matamoros can reach up to approximately 700,000. In addition, the Matamoros–Brownsville Metropolitan Area has a population of 1,136,995, making it the 4th largest metropolitan area on the Mexico–US border. Matamoros is the 39th largest city in Mexico and anchors the second largest metropolitan area in Tamaulipas.
Matamoros is one of the fastest growing cities in Mexico, and has one of the fastest growing economies in the country. The economy of the city is based on its international trade with the United States through the NAFTA agreement, and it is home to one of the most promising industrial sectors in Mexico, mainly due to the presence of maquiladoras. In Matamoros, the automotive industry hosts the assembly and accessories plants for brands such as General Motors, Ford, Chrysler, BMW, Mercedes Benz, and several others. Likewise, Matamoros' economy has historically been based on agriculture, since northern Mexico's biggest irrigation zones are in the municipality.PEMEX announced a multi-billion offshore drilling project for the port of Matamoros, one of the future prospects for Mexico's oil industry.