Capel Celyn was a rural community to the northwest of Bala in Gwynedd, Wales, in the Afon Tryweryn valley.

The villagers first knew about the proposal a few days before Christmas 1955, from reading about it in the Welsh edition of the Liverpool Daily Post.

[3] The flooding of the village was controversial as Liverpool City Council did not require planning consent from the local Welsh authorities as the reservoir was approved via an Act of Parliament.

[2] The villagers created the Capel Celyn Defence Committee, which debated and denounced the scheme all over Wales through newspapers, radio and television.

[3] When the valley was flooded in 1965, the village and its buildings, including the post office, the school, and a chapel with cemetery, were all lost.