Killeenduff (Irish: An Cillín Dubh, meaning "small black church") is a townland within the boundaries of the Roman Catholic parish of Easky, County Sligo in Ireland. Located about a mile from the village of Easky, it is home to The Split Rock. Local legend holds that this rock—though actually carried to its current location by an Ice Age glacier—was split as a result of an argument between two giants and that if one walks through the split three times it will close, entombing the person forever!