Thrace Basin Thrace Basin The European side of Turkey is called the Thrace Basin. It is the largest and thickest Cenozoic sedimentary basin in Turkey. The basin is triangular shaped, trends WNW-ESE and was formed by extension in late Middle Eocene to latest Oligocene times. This gas prone basin is located northwest of Istanbul, Turkey. About 9,000 meters of Eocene-Miocene marine clastics and continental sediments were deposited. Several basement faults were reactivated and underwent strike-slip motion in late Miocene times where the famous North Anatolian Fault bounds the southern part of the basin. The Cenozoic sedimentary succession, overlying Paleozoic to Mesozoic metamorphic
Northern Thrace Bulgaria occurred here: it was 45.2 °C at Sadovo in 1916. Important rivers are the Maritsa and its tributaries. Important cities include Plovdiv, Burgas, Stara Zagora, Sliven, Haskovo, Yambol, Pazardzhik, Asenovgrad, Kardzhali, Dimitrovgrad, Kazanlak and Smolyan. Northern Thrace has an area of 42,073 km². The Ottoman Turks created the autonomous province of Eastern Rumelia in northern Thrace in 1878. The region was annexed to the Principality of Bulgaria in 1885. Northern Thrace Northern Thrace or North Thrace (, ) (as opposed to Western Thrace and East Thrace to the south) constitutes the northern and the largest part of the historical