"There are two islands; one is a bird sanctuary and the other is where
the monastery is located."
"The county of Kerry is situated in the south west of Ireland. It
contains many ancient ruins of monastic settlements and ancient forts
some as old as 2200 BC."
Note that Skellig is apparently visible from the mainland,
particularly Valentia. Also, the distance to Skellig is likely less
than the 11 miles mentioned in the Theo's story; probably more like
6-8 miles as mentioned in various places on the Net (but, of course,
it could be a matter of the starting point reference, as Valentia is 3
miles wide itself).