Llandderfel is a Welsh parish within the ancient district of Penllyn which was formed
in the 1985 when the old parishes of Llanfor and Llandderfel were united under the
Despite being one of the largest parishes in Wales, with an area of nearly twenty
thousand hectares - stretching from Conwy Council’s boundary in the north to Denbighshire
in the north east and to the south east boundary of Powys, it is also one of the
least populated with only 1,511 inhabitants dispersed across the six villages of
Llandderfel, Glanrafon, Llanfor, Frongoch, Cefnddwysarn and Sarnau of which nearly
three quarters are Welsh speaking.
Renowned for its Welsh culture and picturesque landscape, Llandderfel is a tranquil
parish of rivers with the Dyfrdwy (river Dee) running through its centre, and with
its tributaries, the Celyn and Tryweryn forming much of western and southern boundaries.
It was not always so tranquil, in the sixties the valley was controversially dammed,
flooding a Welsh speaking village to form a reservoir to supply Liverpool industry
- water which, in the end, was never needed.
Although the main business of the parish is agriculture, walkers are attracted by
the three mountain peaks of Carnedd y Filiast (669 meters), Foel Cwm Sian Llwyd (648
meters), and Foel Goch (611 meters).