Tryweryn Reservoir is located in Wales, near the village of Tryweryn. It was created in the 1960s by damming the River Tryweryn, primarily to supply water to the city of Liverpool. The reservoir is surrounded by scenic hills and is a popular spot for outdoor activities such as hiking and birdwatching. The construction of Tryweryn Reservoir was controversial, as it led to the flooding of the village of Capel Celyn and the displacement of its residents. This event sparked significant political and social movements in Wales, highlighting issues of local rights and cultural preservation.