Tunca is a river in Bulgaria and Turkey and the most significant tributary of Meriç, emptying into it on Turkish territory near Edirne. The river takes its source from the central parts of Stara Planina north of Kalofer, it then flows east and makes a sharp turn to the south before Yambol, in which direction it flows until it reaches Meriç. Tunca´s length on Bulgarian territory is 350 km. It has about 50 tributaries. (Wikipedia) (Location: Edirne)

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