Pen yr Helgi Du

Pen yr Helgi Du is a mountain summit in the southern Carneddau range, rising to 833 meters (2,733 feet) above sea level. Steep cliffs mark its slopes, and a narrow ridge connects it directly to the neighboring peak of Carnedd Llewelyn.

The mountain has long been part of Welsh geography, situated within the historic region of Caernarfonshire. Traditional stone structures near its western edge reflect centuries of interaction between people and the mountain landscape.

The Welsh name means Peak of the Black Hound, referencing local mythology and storytelling traditions connected to the mountains. Such animal names reflect how people have long understood and remembered the landscape through legend and local lore.

Several hiking routes lead to the summit from Ogwen Valley, with the south ridge path offering a direct ascent for intermediate hikers. Plan your visit during dry conditions, as the steep cliffs and narrow sections demand solid footing and careful movement.

Craig yr Ysfa, a series of vertical cliffs on the western face, attracts climbers looking for technical routes within Snowdonia National Park. These rock walls offer a different kind of challenge compared to regular hiking and draw people seeking more demanding pursuits.