Suisun Bay
Coordinates: 38°04′N 122°04′W / 38.07°N 122.07°WSuisun Bay (/səˈsuːn/ suh-SOON) is a shallow tidal estuary (a northeastern extension of the San Francisco Bay) in northern California. It lies at the confluence of the Sacramento and San Joaquin Rivers, forming the entrance to the Sacramento–San Joaquin River Delta, an inverted river delta. Suisun Marsh, the tidal marsh land to the north, is the largest marsh in California. Grizzly Bay forms a northern extension of Suisun Bay. The bay is directly north of Contra Costa County.
The bay was named in 1811, after the Suisunes, a Native American tribe of the area. The word originates with the Patwin.
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