peninsula in Mexico, between the Pacific & the Gulf of California: divided into a northern state (Baja California), 27,071 sq mi (70,114 sq km), cap. Mexicali; and a southern state (Baja California Sur), 28,447 sq mi (73,677 sq km), cap. La Paz
also Informalthe Baja
Origin of Baja CaliforniaSp, literally , lower California
also Lower California
A mountainous peninsula of western Mexico extending south-southeast between the Pacific Ocean and the Gulf of California south of the US border.