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Wikipedia says:
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El Centro is the county seat of Imperial County, California, United States and the largest city in the Imperial Valley, the region east of San Diego. It is also the largest U.S. city to lie entirely below sea level (- 50 feet). It is the core urban area and principal city of the 'El Centro, California Metropolitan Statistical Area' which encompasses all of Imperial County. It is home to retail, transportation, wholesale, and agricultural industries. El Centro is Spanish, and means the center. The city's population was 37,835 at the 2000 census. The 2006 population is 40,563. The city recently opened up a new enclosed mall. (...) more....
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