|Main source||Zagorje, Pivka
555 m (1,821 ft) 
|River mouth||Flows to Postojna Cave
510 m (1,670 ft) 
|Length||27 km (17 mi) |
|Progression||Unica→ Ljubljanica→ Sava→ Danube→ Black Sea|
|Basin size||262 km2 (101 sq mi) |
The Pivka is a karst lost river in Slovenia. The river is 27 kilometres (17 mi) in length. The Pivka ends in Planina Cave, where it merges with the Rak River and then the Unica River. The confluence of the Pivka and the Rak is one of the largest subterranean confluences in Europe. The Pivka created Postojna Cave, the longest cave system in Slovenia as well as one of its top tourism sites.
- Rivers, longer than 25 km, and their catchment areas, Statistical Office of the Republic of Slovenia
- Kogovšek, Janja; Petrič, Metka; Zupan Hajna, Nadja; Pipan, Tanja. "Planinska jama" [Planina Cave]. In Šmid Hribar, Mateja; Golež, Gregor; Podjed, Dan; Kladnik, Drago; Erhartič, Bojan; Pavlin, Primož; Ines, Jerele. Enciklopedija naravne in kulturne dediščine na Slovenskem [Encyclopedia of Natural and Cultural Heritage in Slovenia] (in Slovenian). Retrieved 17 May 2012.
- Media related to Pivka (river) at Wikimedia Commons
|This article related to a river in Slovenia is a stub. You can help Wikipedia by expanding it.|