Syros is a Greek island in the Cyclades, in the Aegean Sea. It is located 78 nautical miles south-east of Athens.
The largest towns are Ermoupoli, Ano Syros, and Vari. Ermoupoli is the capital of the island and of the Cyclades. It has always been a significant port town, and during the 19th century it was even more significant than Piraeus.