The San Francisco Bay Trail is a bicycle and pedestrian trail that when finished will allow continuous travel around the shoreline of San Francisco Bay. As of 2020, 356 miles (573 km) of the trail have been completed. When finished, the trail will be over 500 miles (800 km) of paved and gravel paths, bike lanes, and sidewalks, linking 47 cities across nine counties and crossing seven toll bridges. It is a project of the Association of Bay Area Governments (ABAG) and the Metropolitan Transportation Commission (MTC), in collaboration with other agencies, private companies, non-profit organizations, and advocacy groups.