Map of the Cyclades: the islands, and the boats between them

The network

Paros sits at the centre of the network with more direct links than any other island, which is why it turns up in almost every itinerary whether or not anyone meant to go there. The western chain is nearly a separate country, joined to the rest by one dashed line that only exists in summer. And the islands with the most boats, Paros, Naxos, Mykonos and Santorini, are also the ones with runways, so the network and the flight map pile up in the same places instead of covering for each other.

Where the Cyclades archipelago actually sits

The group occupies the middle of the Aegean, south-east of Athens. Kea, the nearest island, is about 60 km from the Attic coast. From there the archipelago runs roughly 200 km south-east to Santorini and Anafi, and about 150 km across at its widest, from Kythnos in the west to Amorgos in the east. Everything in it fits inside a box smaller than Sicily, which is why the distances surprise people: the islands are close, and the boats between them are not always there.

The name is older than any of it. Kyklos is Greek for circle, and the ancients understood the group as a ring drawn around Delos, the sacred island at its centre where Apollo and Artemis were held to have been born. Delos is still uninhabited, still at the geometric middle of the group, and still visited only by day boat from Mykonos.

The neighbours matter as much as the group itself, because they are what the Cyclades are constantly confused with. Crete is 120 km south of Santorini across open sea. The Dodecanese, with Rhodes and Kos, run down the Turkish coast well to the east. The Ionian islands are on the other side of the country entirely, reached from different airports. The six groups laid out across both seas is worth two minutes if any of those names are still interchangeable to you.

Every inhabited island, on the chain that serves it

Alphabetical lists of the Cyclades exist everywhere and help nobody. These are the 24 islands with a year-round population, grouped the way the boats group them, which is the only arrangement that tells you anything about a trip.

What sails where, and how long it takes

The map says a crossing exists. It cannot say how long you are at sea or how many chances a day you get, and those two numbers are what turn a line on a map into a plan. Times run from the fast catamaran to the conventional ferry, because both are sold on the same booking page at very different prices. Frequencies are July and August, when they are at their highest and their most stable.

The pattern to take from the table is the fall-off. On the central chain you get six to ten boats a day and a missed sailing costs you an hour. On the western chain you get one or two, and a missed sailing costs you a night. On the seasonal links across the chains you get three to five a week, and a cancelled sailing costs you the rest of the itinerary. The same 90 minutes at sea means three completely different things depending on which line it sits on.

Where the network is thickest

Which islands actually combine

Put a finger on any two islands on the map and count the lines between them. One line is a holiday. Two lines is a travel day. No line is a mistake you find out about at the port.

Paros, Naxos and Santorini is the week that works for most people, in that order, finishing at the caldera and flying home from it. The run down from Piraeus to Paros opens it, then two short hops. Add Ios between Naxos and Santorini if you have ten nights and want a fourth.

Milos, Sifnos and Serifos is the same week on the western chain for two thirds of the money, with fewer boats and no crowd. Milos is the long leg from Athens and the one to book first, then work back up the chain towards Piraeus rather than down it, so the thin end of the timetable is behind you.

Mykonos and Santorini is the trip half the visitors to Greece take, and the map shows why it is also the one most often broken: it is a long open crossing on fast boats that stop sailing in a strong wind while the big ferries carry on. Where you land on Santorini and where you sleep are also further apart than anyone expects.

What does not combine, whatever the distance says: Mykonos with anything on the western chain, Kea with anything at all, and Amorgos with a flight home the next morning. If you are still choosing rather than routing, the guide to which island suits which kind of week is the page to read alongside this one.

Using this map once you are out there

A network map is a picture of what is possible, not a promise about Thursday. The wind decides, not the timetable. The meltemi blows down the Aegean through July and August and it does one specific thing to this map: it takes out the dashed lines first, then the fast boats, and leaves the thick solid lines and the big conventional ferries running. An itinerary built entirely on solid lines survives a windy week. One that depends on a single dashed crossing does not.

Two habits follow from that. Never put a crossing on the day you fly, because a cancelled sailing turns into a missed flight and the insurance rarely calls weather a covered reason. And on any leg with one boat a day, hold the ticket before you leave home rather than at the quay, since the conventional ferries fill with cars and the fast boats fill with people, often several days out. How Greek ferries work, company by company covers the booking side, which is messier than the sailing side.

One last thing the map is honest about. Outside roughly April to October most of this network stops existing. The western chain drops to a couple of sailings a week, the seasonal links vanish altogether, and only Santorini, Mykonos, Naxos, Paros and Syros keep enough boats and enough open doors to be worth the trip. A winter map of the Cyclades would be this one with three quarters of the lines rubbed out.