COLWYN BAY, watering-place, Denbighshire,, North Wales, on the Irish sea, 4olm. W.N.W. of Chester by the L.M.S.R. Pop. of urban district of Colwyn Bay and Colwyn (19oi ), 8,689; 20,885. The town has grown rapidly since 1918, and is now almost continuous with Old Colwyn and Rhos-on-Sea, with which it is linked by a promenade 3m. long. It is a flourishing modern seaside resort and a convenient centre for excursions in North Wales. To the south-east (21m.) is Llanelian-yn-Rhos, famous for its "cursing well" (Ffynnon Elian). The name Col wyn is that of the lords of Ardudwy, the narrow tract of country between the mountains and the sea in west Merionethshire.