With clear large scale ordnance survey route maps the pathfinder chilterns and thames valley walks guide gives you 28 circular graded walks all tried and tested by seasoned walkersthe selection of walks in this pathfinder chilterns and thames valley walks guide offers a great balance of regional variety and interest to give you the best walks in the areafeaturing 28 fabulous circular graded walks all tried and tested by seasoned walkers the routes in the pathfinder chilterns and thames va