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San Francisco Bay

California

Geography

10 of the World's Largest Estuaries

The largest estuary on the West Coast of North America, the San Francisco Bay covers approximately 1,600 square miles — larger than the state of Rhode Island.

The estuary system actually consists of four small bays. Two major rivers, the Sacramento and the San Joaquin, flow into the estuary. They come together near Sacramento, forming a delta region that continues through the Bay Area into the Pacific Ocean. Overall, the San Francisco Bay has a watershed area of more than 75,000 square miles. Many endangered wildlife species make their home in the bay's ecosystem, and it is an important port area for trade and agriculture.

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