Isla Grande de Chiloé
Cucao and Huillinco are two lakes in central Chiloé Island, Chile, linked by a strait forming one hydrologic lake. The two lakes are oriented in west-east fashion cutting off the Chilean Coast Range in Chiloé Island into two ranges; Piuchén to north and Pirulil to the south. The outlet of the lakes, Desaguadero or Cucao River lies at the western end of Cucao Lake, and flows into the Pacific.