Zoom for full flavour & spot the mountain rescue chopper. 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 has been described as "probably the busiest mountain in Britain". 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 ar�ªtes 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. Snowdon boasts some of the best views in Britain, and the summit can be reached by a number of well-known paths, the most demanding of which is the Snowdon Horseshoe. The summit can also be reached on the Snowdon Mountain Railway, a rack and pinion railway opened in 1896 which carries passengers the 4.7 miles (7.6 km) from Llanberis to the summit station. The summit also houses a visitor centre called Hafod Eryri, built in 2006 to replace one built in the 1930s. The name Snowdon is from the Old English for "snow hill", while the Welsh name â�� Yr Wyddfa â�� 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). In Welsh folklore, the summit of Snowdon is said to be the tomb of Rhitta Gawr, a giant. This is claimed to be the reason for the Welsh name Yr Wyddfa, literally meaning "the tumulus". Rhitta Gawr wore a cloak made of men's beards, and was slain by King Arthur after claiming Arthur's beard. Other sites with Arthurian connections include Bwlch y Saethau, on the ridge between Snowdon and Y Lliwedd, where Arthur himself is said to have died. A cairn, Carnedd Arthur, was erected at the site and was still standing as late as 1850, but no longer exists. According to the folklore, Arthur had Bedivere throw his sword Excalibur into Glaslyn, where Arthur's body was later placed in a boat to be carried away to Afallon. Arthur's men then retreated to a cave on the slopes of Y Lliwedd, where they are said to sleep until such time as they are needed. Merlin is supposed to have hidden the golden throne of Britain among the cliffs north of Crib y Ddysgl when the Saxons invaded. Have a nice sunday.