The San Francisco Bay Area

It is an estuary and shallow bay through which it drains approximately forty percent of California’s water, which comes from the Sacramento and San Joaquin Rivers from the Sierra Nevada Mountains, and empties into the Pacific Ocean. It is characterized as a geographic and ethnically diverse metropolitan region.

The Bay Area contains many cities, towns, military bases, airports, national, state and regional parks, united by a massive network of roads, highways, railways, bridges, tunnels and commuter trains.