Treasure Island is an artificial island in the San Francisco Bay between San Francisco and Oakland. It is connected by a small isthmus to Yerba Buena Island. It was created in 1936 & 1937 for the Golden Gate International Exposition of fill dredged from the bay. According to the United States Census Bureau, Yerba Buena Island and Treasure Island together have a land area of 2.334 km² (0.901 sq mi) with a total population of 1,453 as of the 2000 census. The island is named after the novel Treasure Island, by Robert Louis Stevenson, who lived in San Francisco from 1879 to 1880.
Treasure Island is entirely within the City and County of San Francisco, whose territory extends far into San Francisco Bay and to the tip of the island of Alameda, California.
The island has a raised walkway, circumscribing almost its entire bulk, which is popular for recreation. Sea lions can be observed in the water from the shoreline, and construction of the new eastern span of the San Francisco - Oakland Bay Bridge can be observed from the eastern part of the island. The island used to have a gas station, but it is currently unused. It is served by a single Muni bus route, the 108 Treasure Island. It has a job training center, and is also home to San Franciscans and many college students who attend school downtown.