High Quality Content by WIKIPEDIA articles! Yr Arddu is a mountain peak in Snowdonia at 389 Metres high and situated approximately 2.5 Km south east of Beddgelert village and just over 1 Km from the rather more famous mountain Cnicht. It is a rugged hill with widespread rock outcrops and cliffs and as a consequence it is not commonly climbed. It is best approached by footpath leaving the minor road that links Nantmor to Nant Gwynant but the final 0.5 Km has no marked paths and can be a challenge at all times of the year.