|Marin Islands National Wildlife Refuge|
IUCN category IV (habitat/species management area)
View of both Marin Islands as seen from the East Peak of Mount Tamalpais
|Location||Marin County, California, United States|
|Nearest city||San Rafael, California|
|Governing body||U.S. Fish and Wildlife Service|
Marin Islands are the two islands, East Marin and West Marin, situated offshore from San Rafael, California in the San Pablo Bay extension of San Francisco Bay. The islands comprise the Marin Islands National Wildlife Refuge, which was established in 1992. Surrounding submerged tidelands are also included in the refuge.
West Marin Island, elevation 26 meters (85 ft) above the bay waters, supports the largest heron and egret rookery in the San Francisco Bay Area. Nesting species include great egrets, snowy egrets, great blue herons, and black-crowned night herons.
Submerged tidelands support a variety of resident and migratory water birds such as surf scoter, black oystercatcher, diving ducks, and osprey. Refuge objectives are to protect migratory species, including the heron and egret nesting colony, protect and restore suitable habitat for the colony, and protect the tidal mud flats and unique island ecosystem.
The islands are the property of the U.S. Fish and Wildlife Service and require special permission to visit. They were donated to the federal government by the Crowley family of San Francisco. They had been bought by Thomas Crowley at auction in 1926 for $25,000, in the hope that they would become the western terminus of the Richmond–San Rafael Bridge. Instead, they became a family vacation spot for more than sixty years.
See also 
- Martin, James A.; Lee, Michael T. (2006). The Islands of San Francisco Bay. San Rafael, CA: Down Window Press. ISBN 0-9787241-0-0.
- Fish and Wildlife Service (3 March 2009). "Marin Islands NWR". U.S. Department of the Interior. Retrieved 2009-09-05.
- Refuge profile
- Refuge website
- "Marin Islands National Wildlife Refuge". Geographic Names Information System, U.S. Geological Survey.