²⁴De Paor, Liam. "A Survey of Sceilg Mhichíl." The Journal of the Royal Society of Antiquaries of Ireland 85.2 (1955): 180-185.
In addition to the church, oratories, and beehive huts there are three leachta (stone altars) in the monastic enclosure. The two most highly decorated stone crosses are believed associated with these altars. (Skellig Michael World Heritage Site Management Plan 2008 – 2018. Rep. Dublin: Department of Environment, Heritage and Local Government: Office of Public Works, 2008. 81-5.)
The monastic enclosure also had two wells, unusual at such a high elevation. According to Des Lavelle the wells were said to "become dry in the case of cursing, swearing or blasphemy." (Lavelle, Des. Skellig: Island Outpost of Europe. Montreal: McGill-Queen's UP, 1976. 48-52.)