Río Carampangue is a small but ecologically significant river flowing through Arauco Province in the Bío Bío Region of Chile, draining a coastal basin of approximately 1,262 square kilometers within the Nahuelbuta Coast Range. The river originates at the hill of La Piedra, south of the Heights of Purgatorio in the Nahuelbuta Range, and winds its way through one of Chile's most biologically rich coastal watersheds. Its name reflects a rich indigenous heritage — the upper section was historically called Raghleuvu in Mapudungun, meaning "clay river," while the lower section carried the name Carampangue, a compound of caran ("to form a town") and pangui ("the lion"), which eventually became the name for the entire river. The Nahuelbuta Range setting gives the river a distinctly coastal character, differentiating it from the larger Andean river systems of the region and contributing to a unique assemblage of native fish species found within its waters.