The Nišava or Nishava (Bulgarian and Serbian Cyrillic: Нишава, ) is a river in Bulgaria and Serbia, a right tributary, and with a length of 218 km also the longest one, of the Južna Morava.

Read more about Nišava:  Bulgaria, Serbia, Characteristics and Importance, Sićevo Gorge

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Nišava - Sićevo Gorge
... In its Serbian part, the Nišava carved a composite valley with several depressions (Dimitrovgrad, Pirot (or Basara Cyrillic Басара), Bela Palanka ...