The valley is a one-sided graben filled with Tertiary and Quaternary sediments with depth of 150 m to 500 m. There are mineral springs at Slivenski Mineralni Bani.

In Sliven Province are located the city of Sliven and the villages of Blatets, Gavrailovo, Gergevets, Glufishevo, Glushnik, Gorno Aleksandrovo, Dragodanovo, Zhelyu Voyvoda, Zlati Voyvoda, Kaloyanovo, Kamen, Kovachite, Krushare, Malko Chochoveni, Mechkarevo, Panaretovtsi, Samoilovo, Selimovo, Sotirya, Strupets, Topolchane, Trapoklovo, Chintulovo and Chokoba.

In Burgas Province, Karnobat Municipality are located four villages — Venets, Devetak, Devetintsi and Tserkovski.

From west to east from the village of Binkos to the river Mochuritsa it is traversed by a 69.4 km stretch of the first class I-6 road Gyueshevo–Sofia–Karlovo–Burgas.

From north to south between the Petolachakata junction and the village of Mogila passes a 21.2 km section of the first class I-7 road Silistra–Shumen–Yambol–Lesovo.

To the west in direction southwest–northeast between Sliven and Zlati Voyvoda runs a 14 km stretch of the second class II-66 road Sliven–Stara Zagora–Popovitsa.

The first modern factory on the territory of Bulgaria was established there in 1834 by the industrialist Dobri Zhelyazkov, producing textiles.

[3] There is a cable factory of Japanese compaby Yazaki that produces electronic components for automotive industry.

[6][7] The foundations of the defensive walls, the agora, temples, churches, baths, barracks and public buildings have been excavated.