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The Afon Dyfrdwy (The River Dee) is a sixty-eight mile long river which rises at Llanuwchllyn in Snowdonia. The river travels in a south-easterly direction, making its way across the border into England. It then changes course to a northerly direction towards its estuary, between North Wales and The Wirral Peninsula in England. It drains into Liverpool Bay and the Irish Sea.

The River Dee's course takes it through the Welsh towns of Berwyn, Corwen, Llangollen, Wrexham and Connah's Quay, the English town of Farndon and the English city of Chester. At Wrexham the river is a natural border between Wales and England. At Connah’s Quay the river becomes tidal for the last sixteen miles.