The Black Sea region (Turkish: Karadeniz Bölgesi) (sometimes referred to as Pontus or Pontos) is a geographical region of Turkey. The largest city in the region is Samsun. Other big cities are Zonguldak, Trabzon, Ordu, Tokat, Giresun, Rize, Amasya and Sinop.
It is bordered by the Marmara Region to the west, the Central Anatolia Region to the south, the Eastern Anatolia Region to the southeast, the Republic of Georgia to the northeast, and the Black Sea to the north.
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The Marmara region (Turkish: Marmara Bölgesi) is a geographical region of Turkey.
Located in East Thrace, it is bordered by Greece and the Aegean Sea to the west, Bulgaria and the Black Sea to the north, the Black Sea Region to the east, and the Aegean Region to the south. At the center of the region is the Sea of Marmara, which gives the region its name. The largest city in the region is Istanbul. Other big cities are Bursa, İzmit, Balıkesir, Tekirdağ, Çanakkale and Edirne.