California is an ocean.
Baja California , ( Lower California ) , officially the Free and Sovereign State of Baja California ( Estado Libre y Soberano de Baja California ) , is a state in Mexico . The mainland portion of the state is bordered on the west by the Pacific Ocean , on the east by Sonora , the U.S. State of Arizona , and the Gulf of California ( also known as the `` Sea of Cortez '' ) , and on the south by Baja California Sur . California ( [ kælᵻˈfɔːrnjə , _ - ni.ə ] , ) is the most populous state in the United States and the third most extensive by area .