This polygon shapefile depicts the nine counties of the San Francisco Bay Area Region in California. This data was derived from the United States Census Bureau Topologically Integrated Geographic Encoding and Referencing GIS database called TIGER/Line. This coverage is a common base layer used for reference, to identify what county data is within, as well as for cartographic purposes.This dataset was developed/compiled for use in the San Francisco Bay Area Upland Habitat Goals Project, a Project used to identify a Conservation Lands Network (CLN) for biodiversity preservation to inform conservation investments and lasting cooperative conservation partnerships. The Conservation Lands Network GIS Database is the primary output of the Project. The data depicts the spatially explicit CLN that is recommended for the nine county San Francisco Bay Area Region, California.