The Río Cuilco is a river in Guatemala. The river's sources are located in the Sierra Madre just north of Cajolá where it is called Río Blanco. The Río Blanco joins the Las Manzanas River which in turn joins the San Isidro River to form the Cuilco river. The Cuilco follows its largely northward course through San Marcos, and Huehuetenango, crossing the border with Mexico at 15°26′03″N 92°06′24″W / 15.434156°N 92.106800°W, continuing its course northwards into the Presa de La Angostura, one of Mexico's largest artificial lakes. The Cuilco river basin covers an area of 2,274 square kilometres (878 mi) in Guatemala.
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Cuilco River in the context of Chixoy-Polochic Fault
The Chixoy-Polochic Fault, also known as Cuilco-Chixoy-Polochic Fault, is a major fault zone in Guatemala and southeast Mexico. It runs in a light arc from the east coast of Guatemala to Chiapas, following the deep valleys of the Polochic River, Chixoy River and Cuilco River.
View the full Wikipedia page for Chixoy-Polochic Fault