Snowdon is the highest mountain in Wales, with a height of 1085 m (3560 feet), lying in the county of Gwynedd. It is situated in Snowdonia National Park and is described as "probably the busiest mountain in Britain". The mountain is formed from rocks that were produced by volcanoes in the Ordovician period, being extensively sculpted by glaciation, forming the pyramidal peak of Snowdon. It can pe reached by a series of well-known paths. The unique environment of the summit led to its designation as a Natural Nature Reserve. a couple of lakes can be found in the area, such as Llyn Llydaw, Glaslyn, Llyn Ffynnon-y-gwas. The Snowdon Mountain Railway travels from Llanberis to the summit.