The Tryweryn is a river in North Wales which starts at Llyn Tryweryn in the Snowdonia National Park and after 19 kilometres 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 .
The Tryweryn River joins the River Dee roughly half a mile downstream from Bala Lake. The reservoir now at the head of the Tryweryn was created in 1965, to provide water to Liverpool. At that time, the 67 inhabitants of the village of Capel Celyn were forcibly removed.
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