Original: The highest mountains in Wales are in Snowdonia (Eryri), and include Snowdon (Yr Wyddfa), which, at 1085 m (3,560 ft) is the highest peak in Wales.
Simplified: The highest mountains in Wales are in Gwynedd, in the north-west, and include Snowdon (or Yr Wyddfa), which is the highest peak in Wales at 1085 m (3,560 ft).