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.
Sakarya (Turkish: Sakarya ili) is a province and metropolitan municipality in Turkey, located on the coast of the Black Sea. Its area is 4,824 km (1,863 sq mi), and its population is 1,110,735 (2024). The Sakarya River creates a webbing of estuaries in the province, which is in the Marmara Region. The adjacent provinces are Kocaeli to the west, Bilecik to the south, Bolu to the southeast and Düzce to the east. The capital of Sakarya is Adapazarı. Its climate is maritime in the north and humid subtropical in the south and changes by the distance to the Black Sea.Sakarya is on the Ankara-Istanbul highway and is also connected by rail. Sakarya is serviced by Istanbul's Sabiha Gökçen International Airport. The mayor of Sakarya is Yusuf Alemdar as of 2024 (AKP). The city of Sakarya, one of the most important cities in Turkey for its rapid growth and development, is known for its natural surroundings and culture. Home to several resort towns, Sakarya has access to the sea, beaches, lakes, rivers, highlands, thermal springs, traditional Ottoman lifestyle districts such as Taraklı and Geyve and noteworthy historical relics from the Byzantine and the Ottoman eras.The Turks conquered the city of Sakarya in the 13th century. There was intensive immigration from the Caucasus and the Balkans in the 18th and the 19th centuries. The last massive immigration was in 1989 from Bulgaria. The pronvince's location at a transportation crossroads has made spurred development in the manufacturing sector, and it still has inward migration from other parts of Turkey.
The Bulgarian Black Sea Coast (Bulgarian: Черноморие, romanized: Chernomorie), also known as the Bulgarian Riviera, covers the entire eastern bound of Bulgaria stretching from the Romanian Black Sea resorts in the north to European Turkey in the south, along 378 km of coastline. White and golden sandy beaches occupy approximately 130 km of the 378 km long coast. The region is an important center of tourism during the summer season (May–October), drawing millions of foreign and local tourists alike and constituting one of the country's most popular tourist destinations. Prior to 1989 the Bulgarian Black Sea coast was internationally known as the Red Riviera. Since the fall of the Iron Curtain, however, its nickname has been changed to the Bulgarian Riviera.
The Bulgarian Black Sea Coast has a humid subtropical climate (Köppen climate classification Cfa), with considerable maritime and continental influences. The area's average air temperature in the summer is about 28 °C, with the average water temperature at 26 °C. There are more than 240 hours of sunshine in May and September and more than 300 hours in July and August.
Balıkesir Province (Turkish: Balıkesir ili) is a province and metropolitan municipality in northwestern Turkey with coastlines on both the Sea of Marmara and the Aegean. Its area is 14,583 km, and its population is 1,276,096 (2024). Its adjacent provinces are Çanakkale to the west, İzmir to the southwest, Manisa to the south, Kütahya to the southeast, and Bursa to the east. The provincial capital is Balıkesir. Most of the province lies in the Marmara Region except the southern parts of Bigadiç Edremit, Kepsut, İvrindi, Savaştepe and Sındırgı districts and ones of Ayvalık, Burhaniye, Dursunbey, Gömeç and Havran, that bound the Aegean Region. Kaz Dağı (pronounced [kaz daːɯ]), known also as Mount Ida, is located in this province. Balıkesir province is famous for its olives, thermal spas, and clean beaches, making it an important tourist destination. The province also hosts immense deposits of kaolinite and borax, with some open-pit mines. The Kaz mountains are also threatened with the expansion of gold mining using cyanide which puts the villagers' lives, the agricultural economy, and tourism at risk.
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.
The First Geography Congress (Turkish: Birinci Türk Coğrafya Kongresi), which was held in Ankara in 1941, separated Turkey into seven geographical regions, which are still used today.