The Río Grande de Arecibo (Arecibo River) is a river of Puerto Rico

Puerto Rico

Puerto Rico , officially the Commonwealth of Puerto Rico , is an unincorporated territory of the United States, located in the northeastern Caribbean, east of the Dominican Republic and west of both the United States Virgin Islands and the British Virgin Islands.Puerto Rico comprises an...

. The headwaters lie in the mountains to the south of Adjuntas. From there it flows north until it reaches the Atlantic Ocean near Arecibo

Arecibo

Arecibo may refer to:*Arecibo, Puerto Rico, a municipality located by the Atlantic Ocean*Arecibo Observatory, a very sensitive radio telescope located approximately south-southwest from the city of Arecibo...

. The tributaries lie along the side of the Cerro de Punta

Cerro de Punta

Cerro de Punta or just Cerro Punta is the highest peak in Puerto Rico, raising to above sea level. It is located in the municipality of Ponce.-Location:...

 and the Utuado pluton. It flows through the northern Karst

KARST

Kilometer-square Area Radio Synthesis Telescope is a Chinese telescope project to which FAST is a forerunner. KARST is a set of large spherical reflectors on karst landforms, which are bowlshaped limestone sinkholes named after the Kras region in Slovenia and Northern Italy. It will consist of...

province, passing along a gorge that is 200 m deep and 800–1,200 m wide.