Yerba Buena Island sits in San Francisco Bay within the borders of the City and County of San Francisco. The Yerba Buena Tunnel runs through its center and connects the western and eastern spans of the San Francisco–Oakland Bay Bridge, linking the city with Oakland, California. Treasure Island is connected by a causeway to Yerba Buena Island. According to the United States Census Bureau, Yerba Buena Island and Treasure Island together have a land area of 0.901 square miles (2.33 km2) with a total population of 2,500 as of the 2010 census.
Yerba Buena Island with the San Francisco–Oakland Bay Bridge in the foreground
Aerial photo of Treasure Island (top) and Yerba Buena Island (bottom).
Yerba Buena Tunnel, a double-deck tunnel, carries Bay Bridge traffic between the eastern and western spans, seen here westbound
San Francisco Bay is a large tidal estuary in the U.S. state of California, and gives its name to the San Francisco Bay Area. It is dominated by the cities of San Francisco, San Jose, and Oakland.
San Francisco Bay
Aerial panorama of the northern Bay, the Bay Bridge, Golden Gate, and Marin Headlands on a clear morning. November 2014 photo by Doc Searls.
Panorama of San Francisco Bay, and the city skyline seen from Marin County in the Golden Gate National Recreation Area
Population density and low elevation coastal zones in San Francisco Bay (2010). The San Francisco Bay is especially vulnerable to sea level rise.
