A superb mountain crag, with all the atmosphere and adventure that such a description implies. Hidden away at the head of Cwm Eigiau in the depths of the rolling mass of the peaceful Carneddau hills, Craig yr Ysfa sits in a state of secluded serenity. The crag as a whole presents an initially disappointing
vegetated northern front. This rambling mess of heathery ledges is bisected by two major gullies and the real action is located within their confines. The right-hand gully provides the line of the epic Great Gully and the left-hand gully (The Amphitheatre) is where most of the important routes are to be found, including the famous V Diff, Amphitheatre Buttress.
The main Amphitheatre face catches the afternoon sun in the summer months. The routes are reasonably quick to dry, but crack lines will retain drainage for a few days after rain. Ampitheatre Buttress is quick drying, but unpleasant if wet. Great Gully is slow to dry and fills quickly with hand numbing ‘run off’ in wet weather.
The normal route is to walk up the access road to Ffynnon Llugwy, and then follow the path that skirts round the right side of the reservoir. This then zigzags steeply up to the col between Craig yr Ysfa (on the left) and Pen yr Helgi Du (on the right). To reach the base of the crag, descend diagonally from the col, via a small trail.