Kırklareli Province is a province in northwestern Turkey on the west coast of the Black Sea. The province neighbours Bulgaria to the north along a 180-kilometre (110 mi) long border. It borders the province of Edirne to the west and the province of Tekirdağ to the south and province of Istanbul to the southeast. Kırklareli is the capital city of the province. Its area is 6,459 km2, and its population is 369,347 (2022). The province's and its central city's name means "the land of the forties" in Turkish and it may refer either to the forty Ottoman ghazis sent by the sultan Murad I to conquer the city for the Ottoman Empire in the 14th century or to the forty churches reported to be situated in the region before the Ottoman conquest, as attested by the former name of Kırklareli. There is a memorial on a hilltop in Kırklareli city, called "Kırklar Anıtı" to honor the Ottoman conquerors. The province is bisected by the Yıldız (Istranca) mountain range. The north and northeastern parts of the province are among the least populated and under developed parts of Turkey. The districts to the south and west are more populated because the land is better suited for agriculture and industrial development. The north and eastern parts of the province are dominated by forests. Therefore, forestry is an important means of living in these areas. Fishing is done along the Black Sea coast.

Edirne, historically known as Adrianople is a city in Turkey, in the northwestern part of the province of Edirne in Eastern Thrace. Situated 7 km (4.3 mi) from the Greek and 20 km (12 mi) from the Bulgarian borders, Edirne was the second capital city of the Ottoman Empire from 1369 to 1453, before Constantinople became its capital.