San Pablo Bay (Marin County)
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San Pablo Bay is a tidal estuary that forms the northern extension of San Francisco Bay in northern California in the United States. Most of the Bay is shallow; however, there is a deep water channel approximately in mid bay, which allows access to Sacramento, Stockton, Benicia, Martinez, and other smaller Delta ports.
It receives the waters of the Sacramento and San Joaquin rivers, via Suisun Bay and the Carquinez Strait on its northeast end, and it connects to the Pacific Ocean via the San Francisco Bay on its southern end. The bay is heavily silted from the contributions of the two rivers, which themselves drain most of the Central Valley of California. San Pablo Bay also receives the waters of Sonoma Creek through the Napa Sonoma Marsh, San Rafael Creek, and the Petaluma River directly, and the Napa River which flows into the Carquinez Strait via the Mare Island Strait near its entrance into the bay. All tributaries except for Sonoma Creek are commercially navigable and maintained by the U.S. Army Corps of Engineers.
The bay is approximately 10 mi (16 km) across and has an area of approximately 90 sq mi (230 km2).