The Pánuco River, also known as the Río de Canoas, is a river in Mexico fed by several tributaries including the Moctezuma River and emptying into the Gulf of Mexico. The river is approximately 510 kilometres (320 mi) long and passes through or borders the states of Mexico, Hidalgo, Querétaro, San Luis Potosí, Tamaulipas, and Veracruz. According to the Atlas of Mexico, it is the fourth-largest river in Mexico by volume of runoff, and forms the sixth-largest river basin in Mexico by area.