The Chiloé Province () includes all of the Chiloé Archipelago except the Grupo Desertores islands, plus the Isla Guafo, for a total land area of approximately . The administrative center of the province is the city of Castro, while the episcopal see of the Roman Catholic bishopric is Ancud. The province of Chiloé is part of the Los Lagos Region ("Región de los Lagos"), which primarily consists of the Chilean lakes region on the mainland north of Chiloé; the administrative center of the region is Puerto Montt.