Llyn Cau is a stunning mountain lake nestled in the Cadair Idris range in North Wales. Legend has it that a mythical serpent lurks in its depths, adding to the mystical vibe of the area. Surrounded by towering cliffs and rugged landscapes, Llyn Cau is a popular spot for hikers looking to take a break or even brave a swim in its crystal-clear waters. It's definitely worth a visit if you're into breathtaking views and a touch of Welsh folklore!