Afon Tryweryn

Afon Tryweryn

For the flooding of the Tryweryn Valley, see Llyn Celyn.

The Tryweryn is a river in north Wales which starts at Llyn Tryweryn in the Snowdonia National Park and after 19 kilometres (12 mi) joins the river Dee at Bala. It is one of the main tributaries of the Dee and has been dammed to form Llyn Celyn. Water is stored in winter when flows are high, and released over the summer to maintain the flow in the Dee (water from the Dee is used as the water supply for large areas of north-east Wales and for the Wirral and much of Liverpool).