Glaslyn

Snowdon () or Yr Wyddfa (pronounced [ər ˈʊɨ̞̯ðva] (listen)) 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 (historic county of Caernarfonshire). It is the busiest mountain in the United Kingdom and the third most visited attraction in Wales; in 2019 it was visited by 590,984 walkers, with an additional 140,000 people taking the train. It is designated as a national nature reserve for its rare flora and fauna. The rocks that form Snowdon were produced by volcanoes in the Ordovician period, and the massif has been extensively sculpted by glaciation, forming the pyramidal peak of Snowdon and the arêtes of Crib Goch and Y Lliwedd. The cliff faces on Snowdon, including Clogwyn Du'r Arddu, are significant for rock climbing, and the mountain was used by Edmund Hillary in training for the 1953 ascent of Mount Everest. The summit can be reached by a number of paths (there are six main paths) and by the Snowdon Mountain Railway, a rack railway opened in 1896 which carries passengers the 4+3⁄4 miles (7.6 kilometres) from Llanberis to the Summit station. The summit building, called Hafod Eryri, houses a cafe and is open only when the railway is operating; it opened in 2009 to replace one built in the 1930s. The railway generally operates from March to the end of October, with trains running to the summit station from May. The daily running schedule depends on weather and customer demand. Snowdon is one of three mountains climbed as part of the National Three Peaks Challenge.

Garnedd Ugain, often referred to as "Crib-y-Ddysgl", is a pyramidal 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. It is also linked to Cwm Glas to the northeast via a steep arete called Clogwyn y Person, which joins the main Crib y Ddysgl ridge about 500 metres (1,600 feet) east of the summit.

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. The viewpoint is commanding, where the full prominence of Glyder Fawr, Y Garn, Elidir Fawr and Crib Goch can be admired.A second top of the same name can also be found about 1/2 mile to the south-west of Snowdon summit, overlooking Cwm Clogwyn.

The Summit railway station is the southern, upper terminus of the Snowdon Mountain Railway, located within yards of the summit of Snowdon. In 2009 a new station building was opened, which was named Hafod Eryri. 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.

Crib Goch is described as a "knife-edged" arête in the Snowdonia National Park in Gwynedd, Wales. The name means "red ridge" in the Welsh language. The highest point on the arête is 923 metres (3,028 ft) above sea level. All routes which tackle Crib Goch are considered mountaineering routes in winter or scrambles in summer—meaning that they must cross "graded territory" as defined in Steve Ashton's Scrambles in Snowdonia. The easiest of these lines (the ‘bad step’ part of the route) is given a scrambling grade of Grade 1 (the most difficult being Grade 3—routes more difficult than Grade 3 are considered rock climbs).

Y Lliwedd is a mountain, connected to Snowdon in the Snowdonia National Park, North Wales. Its summit lies 898 metres (2,946 ft) above sea level. The eastern flanks are steep cliffs rising above Glaslyn and Llyn Llydaw. Y Lliwedd is the most conspicuous of the peaks for those who approach Snowdon via the Miners' and Pyg tracks. Few that summit Snowdon continue over to Y Lliwedd as the challenge of Wales' highest peak is enough, leaving Y Lliwedd quiet and peaceful even when queues are forming at the summit of Snowdon. Hikers and mountaineers often pass over Y Lliwedd when walking the Snowdon Horseshoe. The noted British climber George Mallory undertook many of his early climbs here. It was also the site of considerable training activity for the 1953 British Everest Expedition. The north face of Y Lliwedd was explored in the late 19th century and in 1909 was the subject of the first British climbing guide, The Climbs on Lliwedd by J. M. A. Thomson and A. W. Andrews. Two subsidiary peaks of Y Lliwedd are listed as Nuttalls: Lliwedd Bach 818 metres (2,684 ft): SH628532 and Y Lliwedd East Peak 893 metres (2,930 ft): SH623532.

Y Lliwedd East Peak is the twin top of Y Lliwedd in the Snowdonia National Park, North Wales. It is only 5 metres shorter than the main summit of Y Lliwedd. The summit marked by a small pile of stones, the views being similar to Y Lliwedd, except for Gallt y Wenallt being in view.

The Afon Colwyn (English: River Colwyn) is a small river in Gwynedd, north-west Wales, a tributary of the Afon Glaslyn. It has its source on the south-western flank of Snowdon. It first flows west to cross the A4085 Caernarfon to Beddgelert road at Pont Cae'r Gors just south of Rhyd Ddu, then flows south parallel to the A4085 to Beddgelert. On the way it is joined by two tributaries, Afon Cwm-du and Afon Meillionen. At Beddgelert it joins the Glaslyn, to then flow south to Tremadog Bay near Porthmadog.The Colwyn is a short and fast-flowing river. It generally carries less water than the Glaslyn, but water levels can rise very rapidly when there is heavy rain. The river is popular with whitewater kayakers and anglers.

Llyn Llydaw (from the Welsh meaning Brittany lake) is a natural lake in Snowdonia National Park on the flanks of Snowdon, Wales' highest mountain. This long thin lake has formed in a cwm about one-third of the way up the mountain. It is one of the most visited lakes in the United Kingdom. Thousands of people every year visit Snowdon and many walk past this lake on the Miners' Track.

Clogwyn is an intermediate station on the Snowdon Mountain Railway. It is located on an exposed ridge overlooking the Llanberis Pass and Clogwyn Du'r Arddu cliffs, a popular climbing spot. The line starts in the valley bottom at Llanberis at an altitude of 353 ft (108 m), Clogwyn station stands at 2,556 ft (779 m).The summit station stands at 3,493 feet (1,065 m), 68 feet (21 metres) below the summit of the mountain. The station opened with the railway on 6 April 1896, but both closed the same day following an accident. They reopened on 9 April 1897 without mishap and have operated since except during wartime. The station has one platform.

Lliwedd Bach is a top of Y Lliwedd in the Snowdonia National Park, North Wales. It is the last "top" on the main ridge of Y Lliwedd, the other being Y Lliwedd East Peak. A broad ridge at around 580m carries on northwards until the subsidiary summit of Gallt y Wenallt is reached. The summit is unmarked and offers good views of Y Lliwedd's cliffs, Snowdon (Yr Wyddfa) and Crib Goch.

The Llanberis Pass (Welsh: Bwlch Llanberis; alternative English name, Pass of Llanberis) in Snowdonia carries the main road (A4086) from the south-east to Llanberis, over Pen-y-Pass, between the mountain ranges of the Glyderau and the Snowdon massif. At the bottom of the pass is the small village of Nant Peris.