I have to admit that I had never heard of Koufonisia until a couple of years ago. Perhaps, this is because these three Cycladic islands are really really small. Actually, only one is inhabited: Ano (or Pano) Koufonisi (‘Upper Hollow Island’). Au contraire, Kato Koufonisi (‘Lower Hollow Island’) and Keros are not. Interestingly, when Greeks say ‘Koufonisia’, they usually refer to Ano Koufonisi, rather than all three. Despite their close proximity to Amorgos and Naxos, these tiny islands are considered remote and often described as ‘hidden gems’, ‘off the beaten track’ or ‘undiscovered paradise’, even for Greeks and Italians, who are the main visitors.   Tip 1: Wander around Hora…