Sliven (Bulgarian: Сливен [ˈslivɛn]) is the eighth-largest city in Bulgaria and the administrative and industrial centre of Sliven Province and municipality in Northern Thrace. It is situated in the Sliven Valley at the foothills of the Balkan Mountains.
Sliven is famous for its heroic haiduti who fought against the Ottoman Turks in the 19th century and is known as the "City of the 100 Voyvodi", a voyvoda being a leader of haiduti.
Northern Thrace or North Thrace (Bulgarian: Северна Тракия, Severna Trakiya; Turkish: Kuzey Trakya; Greek: Βόρεια Θράκη), also called Bulgarian Thrace, constitutes the northern and largest part of the historical region of Thrace. It is located in Southern Bulgaria and includes the territory south of the Balkan Mountains and east of the Mesta River, bordering Western Thrace and East Thrace in the south, and the Black Sea in the east. It encompasses Sredna Gora, the Upper Thracian Plain, and 90% of the Rhodopes.
The climate ranges from subtropical to transitional continental and mountainous. The highest temperature recorded in Bulgaria occurred here: it was 45.2 °C (113.4 °F; 318.3 K) at Sadovo in 1916. The main rivers of the region are the Maritsa and its tributaries. Notable cities include Plovdiv, Burgas, Stara Zagora, Sliven, Haskovo, Yambol, Pazardzhik, Asenovgrad, Kardzhali, Dimitrovgrad, Kazanlak and Smolyan. Northern Thrace has an area of 42,073 km.
42°41′N 26°21′E / 42.683°N 26.350°E
Sliven Province (Bulgarian: Област Сливен, former name Sliven okrug) is a province in southeastern Bulgaria, named after its administrative and industrial centre—the city of Sliven. It has a territory of 3,544.1 km (1,368.4 sq mi) that is divided into four municipalities, with a total population, as of December 2009, of 204,887.
42°15′N 26°0′E / 42.250°N 26.000°E
The Upper Thracian Plain (Bulgarian: Горнотракийска низина, Gornotrakiyska nizina) constitutes the northern part of the historical region of Thrace. It is located in southern Bulgaria, between Sredna Gora mountains to the north and west, a secondary mountain chain parallel to the main Balkan Mountains; the Rhodopes, Sakar and Strandzha to the south; and the Black Sea to the east. A fertile agricultural region, the Upper Thracian Plain proper has an area of 16,032 square kilometres (6,190 sq mi) and an average elevation of 168 metres (551 ft). The plain is part of Northern Thrace. The climate is transitional continental. The highest temperature recorded in Bulgaria occurred here: it was 45.2 °C (113.4 °F) at Sadovo in 1916. The precipitation is 550 millimetres (22 in) a year. Important rivers are the Maritsa and its tributaries, Arda, Tundzha, Stryama, Topolnitsa, and Vacha. Important cities include Plovdiv, Burgas, Stara Zagora, Pazardzhik, Asenovgrad, Haskovo, Yambol and Sliven.
Stara Zagora (Bulgarian: Стара Загора, pronounced [ˈstarɐ zɐˈɡɔrɐ]) is a city in Bulgaria, and the administrative capital of Stara Zagora Province. It is located in the Upper Thracian Plain, near the cities of Kazanlak, Plovdiv, and Sliven. Its population is 121,582 making it the sixth largest city of Bulgaria.
The city has had different names previously, including Beroe, Borui, Irenepolis, Eski Zagra, Augusta Traiana, etc. The earliest traces of civilisation date back to the 7th millennium BC. Some scholars believe that the ancient Thracian city of Beroe was located on the present site of Stara Zagora. In 1968, Neolithic dwellings from the mid-6th millennium BC were discovered in the town, which are the best preserved and richest collection in Europe of its kind and have been turned into a museum.
The Vilayet of Adrianople or Vilayet of Edirne (Ottoman Turkish: ولايت ادرنه; Vilâyet-i Edirne) was a first-level administrative division (vilayet) of the Ottoman Empire.
Prior to 1878, the vilayet had an area of 26,160 square miles (67,800 km) and extended all the way to the Balkan Mountains. However, by virtue of the Treaty of Berlin (1878), the Sanjak of İslimye, most of the Sanjak of Filibe and a small part of the Sanjak of Edirne (the Kızılağaç kaza and Monastır nahiya) were carved out of it to create the autonomous province of Eastern Rumelia, with a total area of 32,978 km. The province unified peacefully with the Principality of Bulgaria in 1885.
Sliven Valley (Bulgarian: Сливенска котловина) is situated in eastern central Bulgaria. It is named after the city of Sliven, its main settlement. It is the ninth of the eleven Sub-Balkan valleys in direction west–east and is the second largest of them, after the Sofia Valley.