Situated along the southern bank of the Rio Grande, Reynosa is a border city in northern Tamaulipas, Mexico. Reynosa is directory across the river from Hidalgo, Texas. Reynosa is the largest and most heavily populated city in Tamaulipas, and among the top five fastest growing cities in Mexico. Founded in 1749, Reynosa was originally named Villa de Nuestra Señora de Guadalupe de Reynosa. Between 1846 and 1848, Reynosa was captured and held by the United States Army.