The Carneddau Challenge Walk is a demanding mountain walk with over 1,500 metres of climbing. The walk begins at sea level from Aber-Ogwen near the Menai Strait and close to the mudflats of Lavan Sands. From Aber-Ogwen the route heads south and crosses the A55 by a road bridge to reach Ty'n-yr-hrndre. The climb begins by road to Bronydd Isaf and then by footpath to skirt the north facing slopes of Moel Wnion, Llefn and Moel Faban. This route will be followed back to Aber-Ogwen after the mountain circuit which begins on the slopes of Moel Faban by following a path south and east to summit Gyrn Wigau. The path now heads due east to Drosgl, Bera Bach, Yr Aryg and Carnedd Gwenllian. Though the path passes to the south of each peak an easy detour will see them all bagged. After Carnedd Gwenllian the route turns to south and soon reaches the high point of Foel Grach at 976 metres. Now the effort of full on climbing is rewarded with an airy ridge walk on the mountain tops to Carnedd Llewelyn (1064 metres), Bwlch Cyfryw-drum, Cefn Ysgolion Duon and Carnedd Dafydd (1044 metres). From Carnedd Dafydd the walk continues down from the mountains via Mynydd Du and Afon Lalfar to the town of Bethesda. Tired walkers in need of refreshment can take a break in Bethesda before the walk continues across to where the original path can be accessed on Moel Faban which leads back to the start at Aber-Ogwen.