Trawsfynydd Lake, situated in Gwynedd, Wales, is a man-made reservoir created in the 1920s to supply water to the Trawsfynydd nuclear power station. Spanning 4 square kilometres, the lake is surrounded by picturesque landscapes and serves as a recreational spot for fishing and boating enthusiasts. Nearby, the ruins of Trawsfynydd Abbey, a Cistercian monastery founded in 1200, add historical depth to the area. The abbey’s remnants include sections of the church and cloister, providing a glimpse into medieval monastic life. Trawsfynydd Lake and Abbey together offer a blend of natural beauty and historical intrigue in the heart of Snowdonia.