At 1,064 metres, Carnedd Llewelyn is the third-highest mountain in Wales and the centrepiece of the vast Carneddau plateau — a high, rolling massif above the northern end of Eryri quite unlike the rocky peaks further south. Named for Llywelyn ap Gruffudd, the last native Prince of Wales, the mountain carries a weight of history as well as altitude. This is Experience #4 of the Snowdonia 100.
The Carneddau Character
The Carneddau are Eryri's quietest mountains. Their bulk is enormous — seven summits above 900 metres — but the walking is on grassy ridges rather than rock, making them approachable for confident walkers who find the rocky terrain of Tryfan or the Glyderau intimidating. The semi-wild Carneddau ponies — a rare ancient breed — roam freely at altitude across the plateau, a sight that feels genuinely wild and remote.
Route from Ogwen
| Start | Ogwen Valley |
| Best approach | Via Pen yr Ole Wen (Experience #8), then ridge north |
| Distance | 14–16km circular |
| Ascent | 1,100m |
| Time | 6–7 hours |
The classic approach climbs Pen yr Ole Wen from Ogwen, then follows the broad ridge northeast over Carnedd Dafydd to Carnedd Llewelyn. The continuation to Foel Grach, Carnedd Gwenllian, and Foel Fras — the Carneddau Ridge Traverse (Experience #15) — is one of the great mountain days in northern Wales, with views across the Menai Strait to Anglesey and, on exceptional days, to the mountains of Ireland.
Experience #4 of 100 — Summits category.
Independently written — Snowdon.com