Roberts Island (California)
Roberts Island is an island in the San Joaquin River delta, in California. It is part of San Joaquin County, and managed by Reclamation Districts 544 (Upper Roberts Island), 524 (Middle Roberts Island) and 684 (Lower Roberts Island). Its coordinates are 37°54′18″N 121°23′07″W / 37.9049250°N 121.3852250°W.