Chiapas has about thirty percent of Mexico's fresh water resources. The Sierra Madre divides them into those that flow to the Pacific and those that flow to the Gulf of Mexico. Most of the first are short rivers and streams; most longer ones flow to the Gulf. Most Pacific side rivers do not drain directly into this ocean but into lagoons and estuaries. The two largest rivers are the Grijalva and the Usumacinta, with both part of the same system. The Grijalva has four dams built on it the Belisario Dominguez (La Angostura); Manuel Moreno Torres (Chicoasén); Nezahualcóyotl (Malpaso); and Angel Albino Corzo (Peñitas). The Usumacinta divides the state from Guatemala and is the longest river in Central America. In total, the state has of surface waters, of coastline, control of of ocean, of estuaries and ten lake systems. Laguna Miramar is a lake in the Montes Azules reserve and the largest in the Lacandon Jungle at 40 km in diameter. The color of its waters varies from indigo to emerald green and in ancient times, there were settlements on its islands and its caves on the shoreline. The Catazajá Lake is 28 km north of the city of Palenque. It is formed by rainwater captured as it makes it way to the Usumacinta River. It contains wildlife such as manatees and iguanas and it is surrounded by rainforest. Fishing on this lake is an ancient tradition and the lake has an annual bass fishing tournament. The Welib Já Waterfall is located on the road between Palenque and Bonampak.