Eregli, Or Erekli(anc. Heraclea), a seaport town of Asia Minor, in the vilayet of Kasta-muni, on the Black sea, 128 m. E. by N. of Constantinople; pop. about 5,000. It has a good harbor, and exports timber, silk, wax, linen, and coal, in exchange for colonial produce, tobacco, and iron. Ship building is carried on to some extent. A few traces are found here of the ancient Heraclea, which was one of the principal towns of Bithynia. Near by is a coal field extending for about 80 m. E. and W. along the shore of the Black sea, and 5 or 6 m. inland. The coal mines are worked under the direction of English engineers, yielding large supplies for steamers and gas works at Constantinople. - There are two other towns of the same name : one in the vilayet and 90 m. E. S. E. of the city of Konieh, in Asiatic, and the other in the vilayet of Edir-neh (Adrianople), 55 m. W. of Constantinople, in European Turkey. The latter has a harbor on the sea of Marmora, and is the see of a Greek bishop.