Llyn Trawsfynydd is a large artificial lake located in Gwynedd, Wales. Created in the 1960s, it was formed by damming the River Trawsfynydd and is primarily used for cooling the nearby Trawsfynydd Nuclear Power Station. The lake covers an area of approximately 1,200 acres and is surrounded by scenic hills and woodlands. The lake is popular for various recreational activities, including fishing, sailing, and walking. It is also home to diverse wildlife, making it a great spot for nature enthusiasts. The surrounding area offers beautiful views and opportunities for outdoor exploration, attracting visitors year-round.