Mare Island

Mare Island
A drab brown strip of land, getting wider towards a flared end on its right side as it droops downward, arcs across the photo like a wilting trombone.
Aerial photo of the southern part of Mare Island
Mare Island is located in San Francisco Bay Area
Mare Island
Mare Island
Mare Island is located in California
Mare Island
Mare Island
Mare Island is located in the United States
Mare Island
Mare Island
Geography
LocationNorthern California
Coordinates38°05′43″N 122°16′41″W / 38.095254°N 122.278004°W / 38.095254; -122.278004
Adjacent toSan Francisco Bay
Administration
State California
CountySolano
CityVallejo

Mare Island (Spanish: Isla de la Yegua) is a peninsula in the United States in the city of Vallejo, California, about 23 miles (37 km) northeast of San Francisco. The Napa River forms its eastern side as it enters the Carquinez Strait juncture with the east side of San Pablo Bay. Mare Island is a peninsula, as no full body of water separates this or several other named "islands" from the mainland. Instead, a series of small sloughs cause seasonal water-flows among the so-called islands. Mare Island is the largest of these at about 3.5 miles (5.6 km) long and a mile wide.