Llyn Trawsfynydd is a large man-made reservoir situated near the village of Trawsfynydd in Gwynedd, North Wales. With a total surface area of 4.8 km² the reservoir is slightly more extensive than Wales's largest natural lake, Bala Lake.
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Address (Unnamed Road), LL41 4, United Kingdom
Coordinates 52°55'32.145" N -3°56'13.644" E