A-B. Starting from the trailhead, follow the purple arrow along the surfaced road for 1.5km to reach a Y-junction - the roadway to the left is a cul-de-sac. This is the point from where the loop ‘proper’ begins - you will return to this point later - for now veer right. Follow the road to a gate into a disused farmhouse. Cross the stile and proceed to the back of the house.
B-C. Behind the house the loop turns right and zig-zags along a line of dry ditches, crosses a stream, and starts an angular ascent onto the ridge from where you have superb views of the Skellig Rocks and the broad Atlantic! Turn left on the ridge - and be aware of the high cliffs on your right as you follow the purple arrows along the official track on the ascent to reach an old stone hut. From here the loop ascends again - this time along the left of a wire fence - to reach the ruins of a military barracks and lookout post. From the barracks the loop turns left.
C-D. Follow the purple arrows on the right of a wire fence as the loop decends gently to a pass at Ducalla and reaches a green road at a stile (on your left). Turn left here.
D-A. Follow the green road downhill into the townland of Ducalla. After 1km you rejoin the outward section at the Y-junction in B above. Turn right and enjoy the 1.5km back to the trailhead.