Bay Area Ridge Trail
The Bay Area Ridge Trail is a proposed 500-mile (800 km) long, multi-use trail encircling the San Francisco Bay Area. Begun in 1989, more than 270 miles (430 km) have been completed as of 2005. The trail council plans to expand this to 300 miles (480 km) by the end of 2005. All of the trail in San Francisco has been completed, as have large portions on the Peninsula, and in Marin, Santa Clara and Contra Costa counties. Most of the remaining mileage is on private property, and may require easements to continue the expansion of the trail.