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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