The Monnow Valley Walk (Llwybr Dyffryn Mynwy)
This is the linear walk of 65 kms (40 miles) through the River Monnow, from Monmouth, near its confluence with the River Wye, to the headwaters below Hay Bluff. Here the walk links up with Offa's Dyke Path National trail, sharing the same route to the finishing point at Hay-on-Wye.
The most useful maps for walkers intending to follow the Monnow Valley Walkare OS Explorer 14 (Wye Valley & Forest of Dean), 189 (Hereford & Ross on Wye) and 13 (Brecon Beacons National Park - Eastern Area).