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Snowdon (; Welsh: Yr Wyddfa, pronounced [ər ˈwɪðva]) is the highest mountain in Wales, at an elevation of 1,085 metres (3,560 ft) above sea level, and the highest point in the British Isles outside the Scottish Highlands. It is located in Snowdonia National Park (Parc Cenedlaethol Eryri) in Gwynedd. It is the busiest mountain in the United Kingdom and the third most visited attraction in Wales; in 2018 it was visited by 558,000 walkers, with an additional 140,000 people taking the train.

Garnedd Ugain, often referred to as "Crib-y-Ddysgl", is a mountain in Wales that forms part of the Snowdon Massif. It is the second highest peak in Wales, and lies just under one kilometre north of the summit of Snowdon itself.It is part of the Snowdon Horseshoe route, being linked to Crib Goch via the col at Bwlch Coch, and to Snowdon summit via the col at Bwlch Glas.

Summit is the southern, upper terminus of the Snowdon Mountain Railway, located within yards of the summit of Snowdon.The line starts in the valley bottom at Llanberis at an altitude of 353 ft (108 m). Summit station stands at 3,493 feet (1,065 m), 68 feet (21 metres) below the summit of the mountain, to which it is connected by a short stepped path.

Llechog is a top of Garnedd Ugain on the Snowdon massif in Wales. It is the top of a long crest of cliffs that start in Llanberis and finishes on Garnedd Ugain. The nearby Clogwyn Station is a stop of the Snowdon mountain railway. The summit is a rocky peak sitting out from cliffs which fall steeply down to the Nant Peris valley.