Isla Grande de Chiloé
South of Puerto Montt the continuation of the Central Valley is made up of a series of marine basins including Reloncaví Sound, Gulf of Ancud, and the Gulf of Corcovado that separates Chiloé Island from the mainland. Further south the valley runs as the narrow Moraleda Channel. Emerged portions include numerous small islands plus the eastern coast of Chiloé Island and Taitao Peninsula east of Presidente Ríos Lake, including the Isthmus of Ofqui. (46°50' S).