The Shima Tract is an island in the Sacramento–San Joaquin River Delta. It is part of San Joaquin County, California, and managed by Reclamation District 2115. Its coordinates are , and the United States Geological Survey measured its elevation as in 1981. It appears on a 1952 USGS map of the area.
The Shima Tract was owned by (and takes its name from) George Shima, a businessman and farmer who at one point produced 85% of California's potato crop.
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