Its stone-built dam, built in the 1880s, was the first of its kind in the world. The Nature Reserve and the area around it are jointly managed by the Royal Society for the Protection of Birds (RSPB), and Severn Trent Water. It was built for the purpose of supplying Liverpool and Merseyside with fresh water. It flooded the head of the Vyrnwy Valley and submerged the small village of Llanwddyn.
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