It is located in close proximity to the cities of Yambol and Nova Zagora.
Sliven is famous for its Bulgarian Haiduts 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 Haiduts.
It is an important economic, transport, cultural, and educational center.
Plovdiv has evidence of habitation since the 6th millennium BC when the first Neolithic settlements were established.
It is said to be one of the oldest cities in Europe.
later being invaded by Persians, Greeks, Celts, Romans, Goths, Huns, Bulgarians, Slav-Vikings, Crusaders and Turks.