Photo 44. Holocene to Recent sand dunes at West Shore, near the mouth of the river Conwy with the northern end of the Snowdonia Mountains in the distance. As sea level rose at the end of the Ice Age river and beach sand was blown onto the North Wales coast to form sand dune complexes, with many similar dune systems also being formed along other parts of the Welsh Coastline. Just off-shore, in many parts of Wales remains of once extensive forests and peat bogs have been found, representing these previously lower sea levels