The Cambrian Mountains are a series of mountain ranges in Wales, covering most of the country from the north coast to the south coast. They include the Brecon Beacons, Carmarthenshire, Ceredigion, Black Mountains, Snowdonia. Great for hiking. Snowdonia is busy, but elsewhere you will be alone in the hills. The Cambrian Way covers all of the Cambrian Mountains; this is a strenuous walk.