Río Grande de Añasco
The Río Grande de Añasco (also, in English, Añasco Big River or just Añasco River) is a river in western Puerto Rico. Its source is in the Cordillera Central mountain range west of Adjuntas, and it flows about 40 miles (64 km) westwards to its mouth on the Mona Passage 4 miles (6.4 km) north of Mayagüez.
Coordinates: 18°16′00″N 67°11′17″W / 18.2666183°N 67.1879583°W
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