It is divided into four sanjaks - Kastamuni, Boli, Changra and Sinope - is rich in mineral wealth, and has many mineral springs and extensive forests, the timber being used for charcoal and building and the bark for tanning.
Of the many interesting caverns in Transylvania the most remarkable are the sulphurous Biidos in the county of Haromszek, the Almas to the south of Udvarhely and the brook-traversed rocky caverns of Csetate-Boli, Pestere and Ponor in the southern mountains of Hunyad county.
From the sea, and after flowing by Boli (anc. Claudiopolis) falls into the Euxine, close to the ruins of the ancient Tium, about 40 m.
BOLI, the chief town of a sanjak of the Kastamuni vilayet in Asia Minor, altitude 2500 ft., situated in a rich plain watered by the Boli Su, a tributary of the Filiyas Chai (Billaeus).
Three miles east of Boli, at Eskihissar, are the ruins of Bithynium, the birthplace of Antinous, also called Antinoopolis, and in Byzantine times Claudiopolis.
In and around Boli are numerous marbles with Greek inscriptions, chiefly sepulchral, and architectural fragments.
The most important are: - Yalova, in the Ismid sanjak; Brusa, Chitli, Terje and Eskishehr, in the Brusa vilayet; Tuzla, in the Karasi; Cheshme, Ilija, Hierapolis (with enormous alum deposits), and Alashehr, in the Aidin; Terzili Hammam and Iskelib in the Angora; Boli in the Kastamuni; and Kha y sa, in the Sivas.