Megalopolis is region made up of several small cities and their surrounding areas in sufficient proximity to be considered a single urban complex (Regional Landscapes of the United States and Canada). The Megalopolis that stretches the California coast from the San Francisco Bay area to Sand Diego is known as SanSan. One of the reasons that characterizes San Diego as a megalopolis is that it has the San Francisco Bay which is easily navigable for ships, Port of San Francisco which has been considered a natural harbor, and the Bay is spanned by six bridges (Golden Gate, Bay Bridge, San Mateo Bridge, Dumbarton, Richmond-San Rafael Bridge, and the Carquinez). Another reason is with the Pacific Ocean as a route to Asia, the Bay Area has been a stop for freight liners to drop off their cargo. San Francisco serves as the regional hub for many arms of the federal bureaucracy, including the U.S. Court of Appeals, the Federal Reserve Bank, and the U.S. Mint.
Source:
http://en.wikipedia.org/wiki/San_Francisco
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