The Gulf of California is a body of water that separates the Baja California Peninsula from the Mexican mainland. It is bordered by the states of Baja California, Baja California Sur, Sonora, and Sinaloa with a coastline of approximately 2500 miles (4000km). Rivers which flow into the Gulf of California include the Colorado, Fuerte, Mayo, Sinaloa, Sonora, and the Yaqui. The gulf's surface area is about 62,000 square miles (160,000 km²). The name "Gulf of California" predominates on most maps in English today. The name "Sea of Cortés" is the one preferred by most local residents.