'The Centaur', Chapter 7, by Algernon Blackwood

Ischia: an island about 30km off the coast from Naples, a little bit northwest of Capri

Obviously far too early for our story, and yet I would hazard a guess that a small island like this probably didn't change a whole lot between 1776 and 1911... Obviously some, but not so much as to invalidate the utility of this picture for our purposes here.