Vulcan Island (California)

Vulcan Island (also known as Shipyard Island) is a small island in the Sacramento–San Joaquin River Delta. It is part of San Joaquin County, California. Its coordinates are 37.98917°N, -121.40611°W, and the United States Geological Survey measured its elevation as 7 ft in 1981. It appears on a 1952 USGS map of the area.