High Quality Content by WIKIPEDIA articles! Helvellyn (Archaic: Helvillon, probably from Cumbric: hal (moor) + velyn (yellow)) is a mountain in the English Lake District, the apex of the Eastern Fells. At 950 metres (3,117 ft) above sea level, it is the third highest peak in both the Lake District and England. The traditional border of Cumberland and Westmorland lies along the Helvellyn Ridge.