Mare Island Naval Shipyard
United States Navy shipyard located in Vallejo, California
The Mare Island Naval Shipyard was the first United States Navy base established on the Pacific Ocean and was in service 142 years from 1854 to 1996. It is located on the peninsula of Mare Island, which is part of the city of Vallejo, on San Pablo Bay in the San Francisco Bay area of California, 23 miles northeast of San Francisco.