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Also Glamis Dunes, Imperial Sand Dunes Recreation Area. Roughly 45 mi (72 km) long by 6 mi (10 km) wide. Spanish word algodones translates to the English word cotton. North Algodones Dunes Wilderness; The federal government protected the northern 25,818 acres (104 km²) in the early 1980s and closed them to vehicles as part of the 1994 California Desert Protection Act. Imperial County, CA.