High Quality Content by WIKIPEDIA articles! Yr Elen is a mountain in the Carneddau range in Snowdonia, Wales. It is the ninth highest mountain in Snowdonia. The average annual temperature of the peak is around 4 celsius. It lies on a short ridge running WNW off the main north-east to south-west ridge of the Carneddau, just over one kilometre from Carnedd Llewelyn.