Green Island (California)
Green Island is an island in the Napa River, upstream of San Pablo Bay. It is in Napa County, California, and managed as part of the Napa-Sonoma Marshes Wildlife Area. Its coordinates are, and the United States Geological Survey measured its elevation as in 1981. It, long with Island No. 1, Island No. 2 and Tubbs Island, are labeled on a 1902 USGS map of the area.