Sean Fletcher is on the final leg of his epic journey around the Wales Coast Path.
South Wales may be the most densely populated section of the coast, but as Sean discovers, it has some of the most spectacular landscapes. He explores the mighty sand dunes at Merthyr Mawr on horseback, discovers how our sea cliffs breath in and out with the pounding of waves and re-creates Marconi's first radio transmission over open water, from Lavernock Point to Flatholm island.
