VOLO, a town and seaport of Greece, on the east coast of Thessaly, at the head, of the gulf to which it gives its name. Pop. (1907) 23,319. It is the chief seaport and second industrial town of Thessaly, connected by rail with the town of Larissa. The anchorage is safe, vessels loading and discharging by means of lighters. The port has a depth of 23 to 25 ft.
The Kastro, or citadel, of Volo stands on or close to the site of Pagasae, whence the gulf took the name of Sinus Pagasaeus or Pagasicus, and which was one of the oldest places of which mention occurs in the legendary history of Greece. From this port the Argonautic expedition was said to have sailed, and it was already a flourishing place under the tyrant Jason, who from the neighbouring Pherae ruled over all Thessaly. Two miles farther south stand the ruins of Demetrias, founded (290 B.C.) by Demetrius Poliorcetes, and for some time a favourite residence of the Macedonian kings. On the opposite side of the little inlet at the head of the gulf rises the hill of Episcopi, on which stood the ancient city of Iolcus. At Dimini, about 3 m. W. of Volo, several tombs have been found which yielded remains of the later Mycenean Age.