Unica (river)

The Unica is a river in Slovenia.  It starts as the underground confluence of the Pivka and the Rak in the Planina Cave.  This is the largest confluence of underground rivers in Europe.   further, the Unica emerges near Planina.  It then is about .  It flows north through the Planina Karst Field (Planinsko Polje) through the municipalities of Postojna, Cerknica, and Logatec, where it returns underground.  It then flows for about another  underground, emerging  lower at multiple springs near Vrhnika to form the Ljubljanica River. 

References

External links
Planinsko polje
Geopedia.si
dedi.si image: http://services.dedi.si/DEDIServer/res/media/image/1176/STRICT/100?1265369496

Category:Rivers of Slovenia
Category:Subterranean rivers
Category:Municipality of Postojna
Category:Municipality of Cerknica
Category:Municipality of Logatec