Llyn Geirionydd, lake in the United Kingdom
Llyn Geirionydd is a lake at the northern edge of Gwydyr Forest where trees meet the lower slopes of the Carneddau mountains. It stretches roughly a mile in length and is surrounded by woodland, with a parking area and picnic facilities near the shore.
The lake was created as a water reservoir to support lead and zinc mining in the region, an important industry from the 18th century onward. The valley preserves remains of mining structures and Klondyke Mill, which used water power from the lake's outflow to process metals.
The name refers to the water-powered industries that once shaped this valley, and the site remains tied to the Welsh poet Taliesin, whose monument on the hill overlooks the lake and draws visitors interested in Welsh literary heritage.
The area is easily reached by car and has a parking lot with toilets open from morning until evening. The site is unstaffed, so visitors should be mindful of their own safety and inform someone of their plans before walking into the forest.
It is the only lake in Snowdonia where power boats and water skiing are permitted, making it distinct from other lakes in the region. These activities are organized by a local club and require special permits.
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