The Celtic Trail extends across the entire breadth of South Wales from the raw and romantic Pembrokeshire coast at the edge of the Atlantic Ocean, through the rural hinterland of Carmarthenshire and the fabled Valleys to the Severn Bridge at the English border.Comprising Route 4, a 360 km linear trail that broadly follows the south coast from Fishguard to Chepstow, and the 250 km Route 47, which offers some glorious alternatives through the heights of the Preselli Hills and the Valleys, the Celtic Trail is a spectacular long-distance journey with shorter loop options, rail-linked sections and traffic-free family rides.