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Richardson Island facts for kids

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Richardson Island<
Aerial image of an island.
USGS aerial imagery of the former location of Richardson Island
Location Northern California
Adjacent bodies of water San Francisco Bay
Highest elevation 16 ft (4.9 m)
United States
State  California
County Marin

Richardson Island is a former marsh island in the Sacramento–San Joaquin River Delta, now completely surrounded by land. It is located in Marin County, California. Its coordinates are 37°56′12″N 122°31′04″W / 37.93667°N 122.51778°W / 37.93667; -122.51778 (Richardson Island), and the United States Geological Survey gave its elevation as 16 ft (4.9 m) in 1981.

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