Pontcysyllte Aqueduct was begun in 1795 to carry a navigable canal across the Dee Valley in north Wales, and is still in operation over 200 years later.
Dechreuwyd Traphont Ddŵr Pontcysyllte ym 1795 i gario camlas fordwyol ar draws Dyffryn Dyfrdwy yng ngogledd Cymru, ac mae'n dal i weithredu 200 o flynyddoedd yn ddiweddarach.