General data
- Name:
- Water system: Danube
- Water type: River
- Progression: Iskar -> Danube -> Black sea -> Mediterranean Sea -> Atlantic Ocean -> Planet Earth
- Climates:
- Continents: Europe
- Countries: Bulgaria
The Zheleznishka reka (Bulgarian: Железнишка река) is a river in western Bulgaria, a left tributary of the Iskar. The river is 11 km long and takes its source from the Kazana area on the eastern slopes of the Vitosha mountain range at an altitude of 1,677 m. The Zheleznishka reka flows entirely in Sofia City Province. Near the confluence with the Egulya are located the Zheleznitsa mineral springs with a total discharge of 8 L/sec and temperature of 23–31.7 °С.