 In the 1898 "Military Notes on Puerto Rico" by the U.S. it is written that Culebrina River "is bounded on the south and east by the Lares Mountain ridge, and on the north by small hills of little interest.From the Lares Mountains it flows from east to west
and empties on the west coast north of San Francisco de la Aguada, in the center of the bay formed between Point Peñas Blancas and Point San Francisco.