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The crest of the East Bay Hills forms part of the northeastern boundary and reaches into the center of the County. The County is bounded on the west by the San Francisco Bay.
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Alameda County encompasses 813 square miles of land and has a population in excess of 1.5 million people, making it the second most populated county in the Bay Area after Santa Clara County. Alameda County is the geographic center of the San Francisco Bay Area, located across the Bay from the San Francisco peninsula, which stretches from the Golden Gate Bridge south to Silicon Valley.
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