13Dames, Michael. Mythic Ireland. London: Thames and Hudson, 1992. 62-3.
"Knockainy Castle." Irish Antiquities. Web. 25 May 2012. <http://irishantiquities.bravehost.com/limerick/knockainy/knockainy.html>.
This is a tower-house of four stories. Part of the top level is gone. The original entrance is intact; there is another entrance in the adjoining wall. The third floor ceiling is vaulted and there is a half vault at the first floor. A murder-hole just inside the entrance leads from first floor level and a spiral stairway in the corner leads to the higher levels. It was said to be a ruin in 1584.
Web correspondent Derek Ryan (10/9/2012) wrote to clarify that the original "Desmond Castle," the more logical location of the "Áine’s Leap" story, is indicated on OS maps by its absence. See this annotated image from the OS map, in which the green arrow points to the ruined Knockainy Castle depicted on our page, and the red arrow shows the site of the (now lost) Desmond Castle. View the original here.