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Coordinates: Cortina Rancheria (formerly, Cortina Indian Rancheria) is a federally recognized Indian tribe in Colusa County, California, at an elevation of 1312 feet (400 m). It is a reservation of the Kletsel Dehe Wintun Nation. It is located about 15 miles west of Arbuckle, California. As of the 2010 Census the population was 21.