The Upper Thracian Plain (, 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 16032 km2 and an average elevation of 168 m. 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 at Sadovo in 1916. The precipitation is 550 mm 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.