The Calbuco Archipelago comprises the islands in the sound, including Tenglo, Maillén, and Huar Islands. Puluqui Island and Queulín Island separate the sound from the Gulf of Ancud.
The Carretera Austral runs along the eastern shore of the sound, but is interrupted in the area where the Reloncaví Estuary opens into this wide sound. Located in this same area is the Alerce Andino National Park, home to ancient alerce trees.
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