Cnoc na Mara is a 100 metre high sea stack living in the South West of County Donegal. It is safe to say this stack represents all that is great about adventure climbing. It's impressive soaring 150m long landward arete provides one of the most rewarding and adventurous rock climbs in Ireland. It is easily an equal to the mighty Old Man of Hoy off the Orkney Islands in the north of Scotland.