The Unica is a river in Slovenia. It starts as the underground confluencehttp://www.dedi.si/dediscina/89-planinska-jama dedi.si of the Pivka and the Rak in Planinska jama. This is the largest confluence of underground rivers in Europe. further, the Unica emerges near Planina. It flows north through the Planina Karst Field (Planinsko Polje) through the municipalities of Postojna, Cerknica, and Logatec, where it returns underground.http://www.geopedia.si/Geopedia_en.html#T1193_F5567:10114012_x442141.871_y81796.85149999999_s14_b4 Geopedia.si It then flows for about another underground, emerging lowerhttp://www.burger.si/Cerknica/PlaninskoPolje/uvod_eng.htm Planinsko polje 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