Gemlik is a town and center of the Gemlik District of Bursa Province. It is located in the east of the Gulf of Gemlik. It is approximately away from Bursa. In antiquity, Gemlik was the location of the ancient Greek town of Cius. Gemlik is an industrial port and it has a freezone trade center. There are also important industrial establishments in south and west of the harbors. The port of Gemlik is one of the busiest import harbors in Turkey. Gemlik is renowned for black olives. Etymology In the Ottoman-era, the town began to be called Gemilik (Eng. shipyard), because there was a shipyard in the town to build Galleons for the Ottoman Navy. As of 1920, the British were calling Gemlik, Geumlek in publications. History Gemlik was the site of the ancient Greek city of Cius (/ˈsaɪəs/; Greek: Kίος or Κῖος Kios), later renamed Prusias on the Sea (/ˈpruːʒəs/; Latin: Prusias ad Mare) after king Prusias I of Bithynia, was an ancient Greek city bordering the Propontis (now known as the Sea of Marmara), in Bithynia and formerly in Mysia (in modern northwestern Turkey), and had a long history, being mentioned by Herodotus, Xenophon, Aristotle, Strabo and Apollonius Rhodius. It was strategically placed at the head of a gulf in the Propontis, called the gulf of Cius, or Cianus Sinus. Herodotus calls it Cius of Mysia; and also Xenophon, from which it appears that Mysia, even in Xenophon's time, extended at least as far east as the head of the gulf of Cius. Pliny the Elder reports that Cius was a Milesian colony. It was at the foot of Mount Arganthonius, and there was a myth that Hylas, one of the companions of Heracles on the voyage to Colchis, was carried off by the nymphs when he went to get water here; and also that Cius, another companion of Heracles, on his return from Colchis, stayed here and founded the city, to which he gave his name. Pliny mentions a river Hylas and a river Cius here, one of which reminds us of the name of the youth who was stolen by the nymphs, and the other of the mythical founder. The Cius may be the channel by which the lake Ascania discharges its waters into the gulf of Cius; though Pliny speaks of the Ascanium flumen as flowing into the gulf, and we must assume that he