Island in California
The Holland Tract is an island in the Sacramento–San Joaquin River Delta. It is part of Contra Costa County, California, and managed by Reclamation District 2025.
 Its coordinates are , and the United States Geological Survey measured its elevation as in 1981. It appears on a 1952 United States Geological Survey map of the area.
References.
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Most of the island is owned by the Metropolitan Water District of Southern California.