High Quality Content by WIKIPEDIA articles! El Centro (formerly, Cabarker), is Spanish for "the center." The name is fitting, because it is the core urban area and principal city of the El Centro metropolitan area which encompasses all of Imperial County. The city is the county seat of Imperial County, the largest city in the Imperial Valley and the east anchor of the Southern Border. El Centro is also the largest American city to lie entirely below sea level (- 50 feet). The city is conveniently near the global cities of San Diego and Los Angeles as well as placed between the major cities of Phoenix and San Diego.