photo: Sonja B.

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. The Nišava originates in western Bulgaria, in the Stara Planina mountain near the village of Gintsi. Its source is close to the Serbian border. It enters Serbia after 67 km of flow through Bulgaria without receiving any major tributaries.