Snowdon, Welsh Yr Wyddfa, highest mountain of Wales, 3,560 ft (1,085 m) high, Gwynedd, NW Wales. Its five peaks are separated by passes. There is a rack and pinion railway (opened 1896) from Llanberis to the summit. The Snowdon district, or Snowdonia, is noted for its scenic beauty most of it is included in Snowdonia National Park (est. 1951). A nuclear power station (500,000-kW capacity completed 1964) and a hydroelectric power project are in the region.

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