Fraisgill, a cavern in Durness parish, Sutherland, on the W base of Whiten Head and the E coast of Loch Eriboll, 6 miles NNE of Heilem ferry. Measuring 50 feet in height and 20 in width at the entrance, it runs about ½ mile into the bowels of the earth, and gradually contracts into lowness and narrowness. Its walls are variegated with a thousand colours so softly and delicately blended, as to outvie the finest productions of the painter's brush.—Ord. Sur., sh. 114, 1880.

(F.H. Groome, Ordnance Gazetteer of Scotland (1882-4); © 2004 Gazetteer for Scotland)