BOLI, the chief town of a vilayet of the same name in Asia Minor, altitude 2,5ooft., situated in a rich plain watered by the Boli Su, a tributary of the Filiyas Chai (Billaeus). Pop. (1927) 56,133. Cotton and leather are manufactured; the country around is fertile, and in the neighbourhood are large forests of oak, beech, elm, chestnut and pine, the timber of which is partly used locally and partly exported to Constantinople. Three miles east of Boli, at Eskihissar, are the ruins of Bithynium, the birthplace of An tinous, also called Antinoopolis, and in Byzantine times Claudio polis. In and around Boli are numerous marbles with Greek inscriptions, chiefly sepulchral, and architectural fragments. At Ilija, south of the town, are warm springs much prized for their medicinal properties.