It is a natural feature of the area.
it was by erosion
Angel Island in San Francisco Bay, California.Angel Island in San Francisco Bay, California.Angel Island in San Francisco Bay, California.Angel Island in San Francisco Bay, California.Angel Island in San Francisco Bay, California.Angel Island in San Francisco Bay, California.
San Francisco Bay
Based on Goode's Atlas (2010), the Sacramento River "empties" into the Sacramento - San Joaquin River - San Francisco Bay Estuary, then into San Francisco Bay and eventually into the Pacific Ocean.
San Francisco is directly adjacent to the bay. Oakland is across the bay.
San Francisco Bay
In the middle of the state we find San Francisco Bay, which is the largest of the bays of California.
San Francisco Bay
San Francisco Bay Times was created in 1979.
San Francisco Bay Guardian was created in 1966.
San Francisco Bay View was created in 1976.
The Bay School of San Francisco was created in 2004.