Mallard Island facts for kids
USGS aerial imagery of Mallard Island; Suisun Bay is to the north, and West Pittsburg is to the south across Mallard Slough.
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 Mallard Island
Location in Sacramento-San Joaquin River Delta
Mallard Island
Location in California
Mallard Island
Location in the United States
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| Geography | |
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| Location | Northern California |
| Coordinates | 38°02′31″N 121°55′07″W / 38.04194°N 121.91861°W |
| Adjacent bodies of water | Suisun Bay |
| Highest elevation | 3 ft (0.9 m) |
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United States
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| State |  California |
| County | Contra Costa |
Mallard Island is a small island in Suisun Bay, at the confluence of the Sacramento and San Joaquin rivers. It is part of Contra Costa County, California. Its coordinates are 38°02′31″N 121°55′07″W / 38.04194°N 121.91861°W, and the United States Geological Survey measured its elevation as 3 ft (0.91 m) in 1981.
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Mallard Island Facts for Kids. Kiddle Encyclopedia.