It is a river of great volume with a course of 55 kilometers originating from small streams, that have their source west of the town of Las Canteras; it runs to the west, north of the city of Los Ángeles, and it empties on the right bank of the Bio Bio, immediately south of the small town of Diuquin.
Near its mouth was the site of the old fort Santo Arbol de la Cruz.
Guaqui, is a derivative of the Mapudungun guaqueñ, "murmur".
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