The ridges of Cym Cesig and Moel Eilio.
Yr Wyddfa - Snowdon is the highest mountain in Wales, at an altitude of 1,085 metres (3,560 ft) above sea level, and the highest point in the British Isles outside Scotland. It is located in Snowdonia National Park (Parc Cenedlaethol Eryri) in Gwynedd and 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.
Snowdon boasts some of the best views in Britain, and the summit can be reached by a number of well-known paths. The summit has been described as "probably the busiest mountain in Britain" as it can also be reached on the Snowdon Mountain Railway which carries passengers the 4.7 miles from Llanberis to the summit station.
The name Snowdon is from the Old English for "snow hill", while the Welsh name – Yr Wyddfa – means "the tumulus", which may refer to the cairn thrown over the legendary giant Rhitta Gawr after his defeat by King Arthur. As well as other figures from Arthurian legend, the mountain is linked to a legendary "Afanc" (water monster) and the "Tylwyth Teg" (fairies)