Bío-bío River

River in south-central Chile. It rises in the Andes on Chile's eastern border and flows generally northwestward to enter the Gulf of Arauco on the Pacific Ocean near Concepción after a course of 240 miles (380 km). The Bío-Bío River traverses the fertile Central Valley and then forms the only major transverse valley through the coastal mountain range. Although it is one of Chile's