The Llanberis Pass lies between the mountain massifs of Snowdon and the Glyderau in the county of Gwynedd, in northwestern Wales. The summit of the pass is above sea level, and is the site of the Pen-y-Pass Hotel, now a Youth Hostel. The A4086 road traverses the pass. The Nant Peris valley lies to the northwest descending to the town of Llanberis, the Llyn Peris and Llyn Padarn lakes and continues on as the Afon Rhythallt to Caernarfon and the Menai Strait. The valley is narrow, straight and steep-sided, with rocky crags and boulders on either side of the road.