
Continue up the road to Ffynnon Llugwy reservoir , then a steep path up Pen yr Helgi Du.
View from a track below the summit of Pen yr Helgi Du (833m - The Hill of the Black Hound) of Ffynnon Llugwy below Carnedd Llewelyn (1064m)
Ffynnon Llugwy (544m) is a Lake in the Carneddau range of mountains and covers an area of some 40 acres. It has a maximum depth of 45m.
Ref: NW 4811.12
Date: 25/09/2025
Location: SH 6972 6259