Andrus Island is an island in the Sacramento-San Joaquin River Delta in Sacramento County, California, twenty kilometres northeast of Antioch. The 3,000-hectare (7,400-acre) island is bounded on the north, and northwest by the Sacramento River, on the west, Georgiana Slough, on the southeast, Mokelumne River, and San Joaquin River, on the southwest Jackson Slough, and Seven Mile Slough. The island is entirely within the bounds of the immense Rio Vista Gas Field, although well drilling pads and associated infrastructure make up only a small part of its land use, which is mainly agriculture.
The city of Isleton is on Andrus Island.
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