The 400-mile (640-km) Río Grijalva, named for the Spanish explorer Juan de Grijalva who discovered it in 1518, is also called the Río Grande de Chiapas in the highland region. It begins in southwest Guatemala and flows north into Chiapas and Tabasco in southern Mexico to the Gulf of Campeche. It is navigable for about 60 miles (100 km) upstream, and several branches of the Usumacinta River flow into it.

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