Unica (river)

{{Infobox river

| name = Unica

| image = PlaninskaJama.jpg

| image_size =

| image_caption = Unica flows out of the cave

| source1_location = Underground confluence of the Pivka and the Rak in Planina Cave

| source1_coordinates= {{coord|45|49|11.17|N|14|14|46.51|E|region:SI-003}}

| mouth_location = Ljubljanica near Vrhnika

| progression = {{RLjubljanica}}

| subdivision_type1 = Country

| subdivision_name1 = Slovenia

| length = {{convert|20|km|mi|abbr=on}}

| source1_elevation = {{convert|500|m|abbr=on}}

| mouth_elevation = {{convert|308|m|abbr=on}} (underground)

| discharge1_avg = {{convert|13|m3/s|cuft/s|abbr=on}} (at the source in Planina Cave), {{convert|24|m3/s|cuft/s|abbr=on}} (at the outflow in Vrhnika)

| basin_size =

}}

File:Unica near Haasberg.jpg

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. {{convert|300|m|sp=us}} 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 {{convert|10|km|sp=us}} underground, emerging {{convert|142|m|sp=us}} lowerhttp://www.burger.si/Cerknica/PlaninskoPolje/uvod_eng.htm Planinsko polje at multiple springs near Vrhnika to form the Ljubljanica River.