Green Island (California)
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 USGS aerial imagery of Green Island | |
  Green Island  Green Island  Green Island | |
| Geography | |
|---|---|
| Location | Northern California |
| Coordinates | 38°12′09″N 122°18′16″W / 38.20250°N 122.30444°W[1] |
| Adjacent to | Napa River |
| Highest elevation | 23 ft (7 m)[1] |
| Administration | |
United States | |
| State |  California |
| County | Napa |
Green Island is an island in the Napa River, upstream of San Pablo Bay (an embayment of San Francisco Bay).[2][3][4][5][6][7][8][9][10][11][12][13][14] It is in Napa County, California, and managed as part of the Napa-Sonoma Marshes Wildlife Area.[15][16] Its coordinates are 38°12′09″N 122°18′16″W / 38.20250°N 122.30444°W[1], and the United States Geological Survey measured its elevation as 23 ft (7.0 m) in 1981.[1] It, long with Island No. 1, Island No. 2 and Tubbs Island, are labeled on a 1902 USGS map of the area.[17]
