The aptly named Somerset Circle is an 88-mile, mostly traffic-free circuit linking Bristol, Bath, the Mendip Hills, the Somerset Levels and the coast. Over two-thirds (about 50 miles) of this potential route has already been completed, and includes the Colliers Way, the Two Tunnels Greenway, the Bristol & Bath Railway Path, and the River Avon Trail.
There are two maps below. The first is the overview in Google Maps, showing the various path types along the route;