The highest mountains in LOCATION@1 are in LOCATION@2 -LRB- Eryri -RRB- , and include PERSON@1 -LRB- Yr Wyddfa -RRB- , which , at NUMBER@1 m -LRB- NUMBER@2 ft -RRB- is the highest peak in LOCATION@1 .

The highest mountains in LOCATION@1 are in LOCATION@3 , in the north-west , and include PERSON@1 -LRB- or Yr Wyddfa -RRB- , which is the highest peak in LOCATION@1 at NUMBER@1 m -LRB- NUMBER@2 ft -RRB- .
