From the LDWA website: A route around Bristol using footpaths, tracks and some sections of rural lanes providing a variety of landscapes with views of the Mendip Hills, Severn Estuary and the Severn road bridges. It takes in Ashton Court, Blaise Castle, and the Clifton Suspension Bridge. It is coincident with the Bristol & Bath Railway Path (16 miles) for two miles at Warmley. It is coincident with part of the Two Rivers Way and links with the River Avon Trail at Keynsham.
The Green Man Ultra uses a slightly modified version of this route.