Richardson Island (Q49674662)

Summary from English Wikipedia (enwiki)

Richardson Island is a former island in San Francisco Bay, in northern California. While it was once surrounded by water and marsh (and appears as an island in maps surveyed in 1894), development of surrounding areas caused it to become completely surrounded by land by the mid-20th century. It is located in Marin County, in the city of Corte Madera.: 27  The United States Geological Survey (USGS) gave its elevation as 16 ft (4.9 m) in 1981. It is near the end of Corte Madera Creek, where it flows into San Francisco Bay.

Wikidata location: 37.9367, -122.5178 view on OSM or edit on OSM

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island (Q23442) place=island

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Former islands of the United States place=islet, place=island, boundary=administrative, admin_level
Islands of Marin County, California place=islet, place=island, boundary=administrative, admin_level
Islands of Northern California place=islet, place=island, boundary=administrative, admin_level
Islands of San Francisco Bay place=islet, place=island, boundary=administrative, admin_level