Cilgwyn quarry is a slate quarry located on the north edge of the Nantlle Valley, in North Wales. It is one of the earliest slate quarries in Great Britain, having been worked as early as the 12th cen

Nantlle is a small village in the slate quarrying Nantlle Valley in Gwynedd, Wales. It lies on the north shore of Llyn Nantlle Uchaf and is part of the community of Llanllyfni. The population was 228