Knight Island (California)

Knight Island is a mostly-submerged island in the Napa River, upstream of San Pablo Bay (an embayment of San Francisco Bay). It is in Solano County, California, and managed as part of the Napa-Sonoma Marshes Wildlife Area. Its coordinates are 38.13583°N, -122.29944°W, and the United States Geological Survey measured its elevation as 3 ft in 1981.