Kupa

Kupa / Kolpa
River valley from Kozice
Kupa River watershed (interactive map)
Location
Countries
Physical characteristics
Source 
  locationRazloge, Gorski kotar, Croatia
  coordinates45°29′28″N 14°41′20″E / 45.491°N 14.689°E / 45.491; 14.689
  elevation313 metres (1,027 ft)
Mouth 
  location
Sava, Sisak, Croatia
  coordinates
45°27′36″N 16°24′08″E / 45.46000°N 16.40222°E / 45.46000; 16.40222
Length297.4 km (184.8 mi)
Basin size10,226 km2 (3,948 sq mi)
Discharge 
  average283 m3/s (10,000 cu ft/s)
Basin features
ProgressionSavaDanubeBlack Sea

The Kupa (Croatian pronunciation: [kûpa]) or Kolpa (Slovene pronunciation: [ˈkóːlpa] or [ˈkóːwpa]; from Latin: Colapis in Roman times; Hungarian: Kulpa) river, a right tributary of the Sava, forms a natural border between north-west Croatia and southeast Slovenia. It is 297 kilometres (185 miles) long, with a length of 118 km (73 mi) serving as the border between Croatia and Slovenia and the rest located in Croatia.