The Bío Bío Region (; ), is one of Chile's fifteen first-order administrative divisions; it is divided into four provinces: Arauco, Bío Bío, Concepción, and Ñuble. It is also known by its original denomination: VIII Region. Concepción is the capital and largest city. Other important cities include Chillán, Coronel, Hualpén, Los Ángeles, and Talcahuano.