St. Kevin's Bed can best be described as a man-made cave cut in the rock face very close to the edge of the mountain. It overlooks the upper lake from a height of about 30 feet (10 metres). The approach to the cave is very difficult, with access to it through a rectangular space and a short passageway 3 ft. (1 metre) high and 2½ ft. wide. The inner or main part of the cave is just 4 ft. wide (1.5 metres) and less than 3 ft.(1 metre) high. It is reasonable to assume that the cave could only have been used as a sleeping place, and would have been impossible for an adult to stand upright in, so it is quite likely that St Kevin only used it as his bed, or a place for pious prayer or meditation. Dr. Leask expresses the opinion that this cave was constructed long before Kevin's time and it was probably the first and oldest piece of work to be undertaken by man in the glen.