Grijalva River, formerly known as Tabasco River (, known locally also as RÃÂo Grande de Chiapas, RÃÂo Grande and Mezcalapa River), is a long river in southeastern Mexico. It is named after Spanish conquistador Juan de Grijalva who visited the area in 1518. This river is born in the Sierra de los Cuchumatanes in the department of Huehuetenango in Guatemala, where it is known as RÃÂo Seleguá and is one of the most important rivers in that country.
The river rises from RÃÂo Grande de Chiapas in southeastern Chiapas and flows from Chiapas to the state of Tabasco through the Sumidero Canyon into the Bay of Campeche. Beginning as "RÃÂo Grande de Chiapas" or "RÃÂo Mezcalapa", later, RÃÂo Grande is stopped at the Angostura Dam (Mexico), one of the largest reservoirs in Mexico, and then its course is now named "Grijalva River". The river's drainage basin is in size. Because of the close connection to the Usumacinta River (the two combine, flowing into the Gulf of Mexico in a single delta), they are often regarded as a single river basin, the Grijalva-Usumacinta River. RÃÂo Grande de Chiapas rises into Sierra de los Cuchumatanes, Huehuetenango; in Guatemala receives the name "Selegua River" and also is a large river.
After flowing from Nezahualcoyotl Lake, an artificial lake created by the hydroelectric Malpaso Dam, Grijalva River turns northward and eastward, roughly paralleling the ChiapasâÂÂTabasco state border. It flows through Villahermosa (where, in 2001, a new cable-stayed bridge was constructed to cross the river) and empties into the Gulf of Mexico, approximately northwest of Frontera. The river is navigable by shallow-draft boats for approximately upstream.