Tundzha

Tundzha, Tunca
The Tunca River at Edirne, Turkey
Location
Country	Bulgaria, Turkey
Physical characteristics
Source
• location	east of Botev Peak, Stara Planina, Bulgaria
• coordinates	42°43′40″N 24°58′10″E / 42.72778°N 24.96944°E / 42.72778; 24.96944
• elevation	1,940 m (6,360 ft)
Mouth
• location	Maritsa at Edirne, Turkey
• coordinates	41°39′42″N 26°33′44″E / 41.6616°N 26.5622°E / 41.6616; 26.5622 (Tundzha River mouth)
Length	ca. 365 km (227 mi) (328.4 km (204.1 mi) in Bulgaria)[1]
Basin size	ca. 8,430 km2 (3,250 sq mi) (7,891 km2 (3,047 sq mi) in Bulgaria)[1]
Basin features
Progression	Maritsa→ Aegean Sea

The Tundzha (Bulgarian: Тунджа [ˈtund͡ʒɐ]; Turkish: Tunca [tund͡ʒa]; Greek: Τόνζος [ˈtonzos]) is a river in Bulgaria and Turkey (known in antiquity as the Tonsus) and the most significant tributary of the Maritsa, emptying into it on Turkish territory near Edirne.

The river originates in the central parts of Stara Planina north of Kalofer, initially flowing east and then making a sharp turn to the south before Yambol, in which direction it flows until it reaches the Maritsa. The Tundzha's length is about 365 km, of which 328 km is on Bulgarian territory (including border). It has about 50 tributaries, the more important of which are Mochuritsa, Popovska, and Sinapovska.

Towns on the banks of the river include Kalofer, Yambol, and Elhovo.