Correction for the size of San Diego
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How big is 5,123,000 acres?
It's about twenty times as big as San Diego
The size of San Diego is about 207,500 acres.
(California)
The second-largest city in California and the eleventh-largest in the United States as of 2009, San Diego measures 207,500 acres in total area. The city is known for its defense manufacturing and biotechnology industries.