El Rio Grande de Arecibo originates in the Central Cordillera of Puerto Rico and flows northward from Lago Adjuntas through Lago Dos Bocas ("Two Mouths Lake") to the coast. The topo map shows some significant gradient downstream of Lago Adjuntas. See this link for an overview of the rivers of Puerto Rico.
Lat/longitude of the putin and especially of the takeout are a rough guide, from online maps.
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