Llangollen is a town and community, situated on the River Dee, in Denbighshire, Wales. Its riverside location forms the edge of the Berwyn range, and the Dee Valley section of the Clwydian Range and Dee Valley Area of Outstanding Natural Beauty, with the easternmost point of the Dee Valley Way being within the town. It had a population of 3,658 at the 2011 census.

The River Dee is a river flowing through North Wales, and through Cheshire, England, in Great Britain. The length of the main section from Bala to Chester is 113 km and it is largely located in Wales. The stretch between Aldford and Chester is within England, and two other sections form the border between the two countries.