Aberglaslyn Pass
South of Beddgelert, the River Glaslyn forces its way through one of the most dramatic gorges in Wales, where sheer oak-clad cliffs plunge to churning white water below. The Aberglaslyn Pass is raw, cinematic Snowdonia at its most untamed.
Walking the Gorge
The path from Beddgelert village follows the river south for roughly two miles, hugging the rocky bank as the valley walls close in around you. The trail alternates between calm, mirror-still pools and fast-moving rapids frothing white over boulders — keep your eyes open for dippers darting across the water and kingfishers flashing electric blue against the grey rock.
Part of the route passes through the old Aberglaslyn railway tunnel, a short but thrilling section where the path narrows to a ledge above the river. A torch is handy and sturdy footwear is essential — the rocks are polished smooth by centuries of river spray.
Wildlife & Seasons
The ancient oak woodland lining the gorge is a designated Site of Special Scientific Interest, rich in mosses, lichens and ferns that thrive in the perpetual damp. In autumn the canopy turns a blazing amber and the river runs high and thunderous after rain — arguably the most spectacular time to visit.
The National Trust manages the Craflwyn estate nearby, and the Aberglaslyn gorge forms part of their circular walking trail that also visits Gelert's Grave and Bryn Du — a satisfying full-day loop.
Aberglaslyn Pass on video
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