A small cave on the edge of a large buttress, visible from across Nant Gwynant. A number of high quality boulder problems from tricky to desperate.
Park at the campsite (pay £5 in season) and walk through the campsite to a footbridge at the far corner. Head left on the other side and follow a path for a good while till you reach the back of the rock buttress/hill. Drop down round the back and follow the short steep path which brings you to the edge of the lake and the Cave is visible on your left.