Cauto River
The Cauto River or Río Cauto is the longest river in Cuba, as well as the longest river in the Caribbean. Located in the southeast of the island, it is one of two navigable rivers in Cuba, the other being the Sagua la Grande River. Overview. The Cauto flows for from the Sierra Maestra to the west and north-west, and enters the Caribbean Sea north of Manzanillo. However, it provides only of naviaable waterway. A 2013 study led by multiple Cuban academic institutions determined that the river could be 'classified as unpolluted to moderately polluted'. It flows  through the provinces of Santiago de Cuba, Holguin, and Granma. The communities of Palma Soriano, Cauto Cristo, and Rio Cauto are located along the river. Rice, sugarcane, tobacco, and cattle are the primary agricultural beneficiaries along its course.