The River Ceiriog (Welsh: Afon Ceiriog) is a river in north east Wales. It is a tributary of the River Dee. It rises on the south east slopes of Moel Fferna in the Berwyn Mountains, and flows through the Ceiriog Valley in Wrexham County Borough. It flows below Chirk Castle and the town of Chirk, where the Chirk Aqueduct carries the Llangollen Canal over the river. The Ceiriog joins the Dee east of the town. In its lower reaches the river forms the border between Wales and Shropshire in England.
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