Ios sits in the southern part of the central Cyclades group, just south of the Greek islands of Naxos and Paros.
Once considered the party capital of the Med, the glory days of Ios have faded as the island lost out to more nakedly aggressive beach party resorts as Faliraki, on Rhodes, and Ayia Napa, on Cyprus.
Nevertheless, Ios remains a major hedonist outpost where sun, sex and sin await youngsters from all over the world. They have been sailing in for decades for the annual beach bar binge.
Once neck-and-neck with Faliraki for the Greek islands' top party island title, Ios is considerably tamer today than it once was.
Long-suffering slanders have worked hard to cast off the island's loutish reputation. Brassed off locals, annoyed at the booze-sodden behaviour of young visitors, imposed a 3am weekday shutdown on clubs.
Some will dub Ios a party island and nothing else, but the clubs, bars and discos are totally confined to the island capital port, Chora village on the hill above it and Mylopotas beach beyond.
Outside the booze happy capital there lies a classic Greek island with some simply wonderful beaches and timeless villages easily reached on well-paved island roads.
If you are not the party type then avoid the capital and head north or east for peace and tranquillity on some of the best Greek island beaches you will ever come across.