San Francisco Bay
San Francisco Bay is a shallow, productive estuary through which water draining about forty percent of California, flowing in the Sacramento and San Joaquin rivers from the Sierra Nevada mountains and Central Valley, enters the Pacific Ocean. Technically, both rivers flow into Suisun Bay, which help flows through the Carquinez Strait to meet with the Napa River at the entrance to San Pablo Bay, which connects at its south end to San Francisco Bay, although the entire group of interconnected bays are often referred to as "the San Francisco Bay."
The Bay covers somewhere between 400  and 1,600  square miles (1,040 to 4,160 square kilometres), depending on which sub-bays (such as San Pablo Bay), estuaries, wetlands, and so on are included in the measurement.
The city of Berkeley, the Bay and Marin County in the background as seen from the Claremont Canyon reserve
- 1999 Grolier Multimedia Encyclopedia.
- 1988 Encyclopædia Britannica.
- San Francisco Bay: Portrait of an Estuary, David Sanger and John Hart, University of California Press
- Barging In - A Short History of Liveaboards on the Bay
- Army Corps of Engineers Bay Model: Working scale model of the Bay
- BoatingSF.com: Photos of SF Bay and its boats, plus online cruising guide
- SF Estuary Institute: San Francisco Bay Historical View Maps