Llyn Celyn is a large reservoir in the valley of the River Tryweryn in Gwynedd, Wales. It measures 4.0 km long by 1.6 km wide, and has a maximum depth of 43 m. It has the capacity to hold 71,200,000 cubic metres of water.
It was originally to be named Llyn Tryweryn Mawr (meaning “Great Tryweryn Lake”), but in 1964 Liverpool Corporation agreed to the name change following a letter by the Tryweryn Defence Committee.
More details: https://en.wikipedia.org/wiki/Llyn_Celyn
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