or Matamoros, a town and port of Mexico, department of Tamaulipas, situated on the right bank of the Rio Grande, about 40 miles from its mouth. The town is well built, and is the seat of a considerable trade. The principal articles of export are specie, horses, wool, and hides; and the imports consist of manufactured goods from Great Britain and the United States. The town has but recently grown to its present importance, from a small village. Pop. about 10,000.