Bithynia is a region in the northwest of Anatolia bordered by the Black Sea (Pontus Euxeinos) to the north, the Dardanel Strait (Hellespontos) and Kocacay (Rhyndakos) to the west, and the Sakarya River (Sangarios) to the south. A point of the Asian continent extending towards Europe, Bithynia is surrounded by seas on its three sides and has a long shore. Nicomedeia, once the capital of Bithynia, is an important city due to its location. Since the gulf is Bithynia is a region in the northwest of Anatolia bordered by the Black Sea (Pontus Euxeinos) to the north, the Dardanel Strait (Hellespontos) and Kocacay (Rhyndakos) to the west, and the Sakarya River (Sangarios) to the south. A point of the Asian continent extending towards Europe, Bithynia is surrounded by seas on its three sides and has a long shore. Nicomedeia, once the capital of Bithynia, is an important city due to its location. Since the gulf is