A beautiful heavily wooded valley in North Pembrokeshire.
It runs for about 9 miles from the? Preseli Hills - where the Gwaun River rises to the east of Pontfaen, to Lower Town Fishguard.
This steep-sided valley occupies a meltwater channel formed subglacially during the later stages of the Ice Age, some 15,000 to 10,000 years ago,
geologists consider it one of the most important meltwater channels in Britain.