Cosán an Oilithrigh or Pilgrims Path at Sliabh Liag is a stunning 4km access route on to the plateau of Sliabh Liag. It follows the ancient path up a U-shape valley nestled between Leargadachtan Mountain and the sea cliffs at Shanbally, overlooking the small fishing village of Teelin in South West Donegal. Following the old green road from the car park at Ballymore you round the corner where the wide green and impressive horseshoe-shaped valley unfolds in front of you. As you round the valley floor beneath you, you start climbing to reveal spectacular views over Teelin Harbour and the Wild Atlantic as well as Counties Sligo and Mayo beyond. Rounding the next corner, you climb up to the viewing area at the waterfall. This is as far as the wide track takes you, and unless you are an experienced walker with good equipment, or you have a guide with you please turn around here.
Going past the waterfall, the road narrows into a rough track, that will lead you into a strong climb, taking you up to over 500m above sea level. As you reach the first plateau, striking views over Lough Agh and over the valley of Glencolmcille reveal themselves ahead. A short hike to the left will take you past the ruined remains of the chapel associated with the Saints Aedh Mac Bric and Assicus. Follow the route up onto the next plateau, and you have the most magnificent panoramic views taking in 7 counties. Please take great care in this area, the weather can change very quickly, and visibility can disappear in minutes. If in doubt, follow the yellow safety markings back to the top of the rough path leading you back down into the valley.