Ben Loyal is composed chiefly of granite, and has a distinctive shape due to the four rocky peaks, the highest of which is called An Caisteal. To the north of An Caisteal is the 712 m Sgòr Chaonasaid, to the south is Bheinn Bheag (744 m), which cannot be seen in the photograph opposite, and to the west is the ridge of Sgòr a Chèirich, 644 m at its highest point. The fourth peak in the picture is the 568 m Sgòr Fionnaich.