Los Lagos Region is one of Chile's 16 regions, which are first order administrative divisions, and comprises four provinces: Chiloé, Llanquihue, Osorno and Palena. The region contains the country's second largest island, Chiloé, and the second largest lake, Llanquihue. Its capital is Puerto Montt; other important cities include Osorno, Castro, Ancud, and Puerto Varas. The mainland portion of Los Lagos Region south of Reloncaví Sound is considered part of Patagonia.

Llanquihue Province is one of four provinces of the Chilean region of Los Lagos (X). Its capital is Puerto Montt. Chile's second largest lake, Lake Llanquihue, is located in the province as well as four volcanoes: Osorno, Calbuco, Puntiagudo and Cerro Tronador.