The Holland Tract is an island in the SacramentoâÂÂSan 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.
Most of the island is owned by the Metropolitan Water District of Southern California.