|Kupa / Kolpa|
|• location||Razloge, Gorski kotar, Croatia|
|• elevation||313 metres (1,027 ft) |
|Sava, Sisak, Croatia|
|Length||297.4 km (185 mi) |
|Basin size||10,226 km2 (3,948 sq mi) |
|• average||283 m3/s (10,000 cu ft/s)|
|Progression||Sava-> Danube-> Black Sea|
The Kupa (Croatian pronunciation: [kûpa]) or Kolpa (Slovene pronunciation: ['kó:lpa] or ['kó:wpa]; from Latin: Colapis in Roman times) 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 its border part having a length of 118 km (73 mi) and the rest located in Croatia.
The name Colapis, recorded in antiquity, is presumed to come from the Proto-Indo-European roots *quel- 'turn, meander' and *ap- 'water', meaning 'meandering water'. An alternative interpretation is *(s)kel-/*skul- 'shiny, bright', meaning 'clear river'.
The Kupa originates in Croatia in the mountainous region of Gorski Kotar, northeast of Rijeka, in the area of Risnjak National Park. It flows a few kilometers eastwards, receives the small ?abranka River from the left, before reaching the Slovenian border.
It then continues eastwards between the White Carniola region in the north and Central Croatia in the south. The Kupa receives influx from the river Lahinja from the left in Primostek, passes Vrbovsko, and eventually detaches from the Slovenian border having passed Metlika.
It then reaches the city of Karlovac, where it receives influx from two other rivers from the right, Dobra and Korana (which in turn is joined by Mre?nica). The Kupa continues flowing to the east, where it merges with Glina from the right, it then passes through two small towns called ?i?inec and Brki?evina, and then proceeds to the town of Sisak where it merges with Odra from the left and, after passing through Sisak town centre, flows into the Sava River.
Fairly unpolluted downstream to Karlovac, the upper Kupa is a popular place for bathing in summer. The section from Stari Trg down to Fu?kovci since 2006 is part of the Slovenian Krajinski park Kolpa nature reserve.