Tvarditsa Valley is situated in central Bulgaria. It is named after the town of Tvarditsa, its main settlement. It is the eighth of the eleven Sub-Balkan valleys in direction west–east.
Partial view of the valley
The submerged Church of St John of Rila in Zhrebchevo Reservoir
The Tundzha is a river in southeastern Bulgaria and northwesternmost Turkey, a left tributary of the Maritsa. With a length of 390 km, of which 350 km are in Bulgaria, it is Maritsa's longest tributar
The Tundzha near Elhovo, Bulgaria
The upper course of the Tundzha in the Balkan Mountains