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Riesco Island () lies at west of the Brunswick Peninsula, Chile. It is one of the largest islands in Chile, with an area of . Its highest point is Mount Atalaya at . The island is bordered by two large piedmont embayments: Otway Sound and Skyring Sound. The narrow Fitzroy Channel connects both bodies of water and separates the island from mainland Patagonia. The island is separated from the southern part of the Muñoz Gamero Peninsula by another narrow channel, the Geronimo Channel.
Riesco Island hosts Chile's largest known coal reserves, with mining activities dating back to 1880. There were the mines Magdalena, Elena and Josefina. In 1940 Magdalena and Josefina produced 100,000 tons.Article in Chilean newspaper La Prensa Austral, El canal Fitz Roy by Silvestre Fugellie11 on 11 July 2012, retrieved on 12 February 2013 It is thought to contain more than 300 million tonnes of low-quality coal in three deposits located in the colonized portion of the island: Río Eduardo, Elena and Estancia Invierno.
Numerous can be found on other parts of the island. In the northwest, an icefield is the source of 7 glaciers and Cerro Ladrillero has 12 glaciers on its slopes. In the southwestern portion of the island, Córdova Peninsula marks the eastern limit of the Strait of Magellan and is home to several mountain glaciers.
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