The Suárez River is a river in the Eastern Ranges of the Colombian Andes. The river originates in Lake Fúquene on the border of Cundinamarca and Boyacá and its mouth is the confluence with the Chicamocha River, forming the Sogamoso River in Santander. It is part of the Magdalena Basin flowing towards the Caribbean Sea.
The 172 kilometres (107 mi) long river is one of the longest on the Altiplano Cundiboyacense and forms the natural borders of Cundinamarca and Boyacá and Boyacá and Santander in its upstream and downstream part respectively. The river formed the trajectory for the Spanish conquest of the Muisca, when the conquistadors went uphill into the Andes from the tropical lowlands of Barrancabermeja in the north. The difference in altitude along the river course, from 2,538 metres (8,327 ft) at the source to 700 metres (2,300 ft) at its mouth, in its 98,230 square kilometres (37,930 sq mi) large basin causes climatic variations, especially with respect to precipitation. The frequent floodings of the river have given the Suárez River its name; conquistador Gonzalo Suárez Rendón tried to cross the river in one of his conquest expeditions, but the sudden flooding made his horse drown in the Suárez River.
The Suárez River is named after conquistador Gonzalo Suárez Rendón, after his horse drowned in the river when it experienced sudden flooding. The original name in Chibcha, given by the Guane was Saravita, meaning "departs from here".