Lluest-wen Reservoir was constructed in 1898, but came to national attention in 1969 when a major leak caused an evacuation of residents down-valley while emergency repair work was carried out. …
At the far point of the Skyline trail is a viewpoint where you can look out into the Brecon Beacons, and hopefully (on a clear day) catch a glimpse of the National Park's highest peak – Pen y Fan.