Seno Otway is a large inland sound lying between Brunswick Peninsula and Riesco Island. It occupies a valley blocked by a large terminal moraine left by the retreat of a glacier during the last glacial period. In spite of being located east of the Andes, it is connected to the open Pacific Ocean through the Strait of Magellan via a narrow passage, which cuts into the Andean massif. Seno Otway also is connected with Seno Skyring by the Fitz Roy Channel.
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