Marin Islands are two small islands, namely East Marin and West Marin in San Rafael Bay (an embayment of San Pablo Bay), Marin County, California. The islands are located at the shoreside of the City of San Rafael, in the north of the San Francisco Bay Area. Marin Island pair embodies Marin Islands National Wildlife Refuge (1992).
In the entire San Francisco Bay, the West Marin Island holds up the utmost breeding place for heron and egret. The East Marin Island holds up a habitat for varied native plant species and renders crucial nesting material. However, the U.S. Fish and Wildlife Service governs the Islands, and visitors need special permission to visit.