Corinthian Island

Corinthian Island is a former island in the San Francisco Bay,  that was later attached to the mainland. It is in Marin County, California, by the Tiburon Peninsula. Its coordinates are 37.87278°N, -122.45889°W, and the United States Geological Survey gave its elevation as 72 ft in 1981. It appears on a 1950 USGS map of the area.