BIO-BIO, an inland province of southern Chile, bounded north and west by the province of Concepcion, south by Malleco and Cautin, and east by Argentina. It has an area of about 7,700 sq.m. of well-wooded and mountainous country, including, since 1928, most of the former province of Malleco, and exports timber to a large extent. Its population in 1930 numbered 180, 688, including incorporated parts of Malleco. The great trunk railway from Santiago south to Puerto Montt crosses the western part of the province and also connects it with the port of Con cepcion. The capital, Los Angeles (pop. [193o] 17,202) is situated about 151m. E. of this railway and is connected with it by a branch line.
a river of southern Chile, rising in the Pino Hachado pass across the Andes, 38° 45' S. lat., and flowing in a general north-westerly direction to the Pacific at Concepcion, where it is 2 m. wide and forms an excellent harbour. It has a total length of about 225 m., nearly one-half of which is navigable.