Lemnos (Greek: Λήμνος) is an islan in the northern part of the Aegean Sea. It is part of the Greek prefecture of Lesbos and has a considerable area, about 477 km². Lemnos is mostly flat (hence its 30+ sandbeaches), but the west, and especially the north-west part, is rough and mountainous (highest elevation: Mount Vigla, 470 m.). The chief towns are Myrina, on the western coast, and Moudros on the eastern shore of a large bay in the middle of the island. Myrina (aka Kastro, meaning Castle) possesses a good harbour, which is in the process of being upgraded through construction of a west-facing sea wall. It is the seat of all trade carried on with the mainland. The hillsides afford pasture for sheep, and Lemnos has a strong husbandry tradition, being famous for its feta and melipasto cheeses, and for its yoghurt. Fruit and vegetables that grow on the island include almonds, figs, melons, watermelons, tomatoes, pumpkins and olives. The main crops are wheat, barley, sesame; in fact Lemnos was Constantinople's granary during Byzantine times. Lemnos also produces what is probably the best honey in the world (from thyme-fed bees), but, as is the case with most products of a local nature in Greece, the produced quantities are little more than simply sufficient for the local market. Muscat grapes are grown widely, and are used to produce an unusual table wine that is dry yet has a strong Muscat flavor. Since 1985 the variety and quality of Lemnos wines has increased impressively. The island has an excellent airport, possessing a very long runway, capable of supporting Antonov carriers.