Kupa River

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Kupa / Kolpa
Kolpa at Prelesje (Slovenia)
Kolpa at Prelesje (Slovenia)
Origin Razloge, Gorski kotar, Croatia
Mouth Sava, Sisak, Croatia
Basin countries Croatia, Slovenia
Length 296 km
Source elevation 313 m
Avg. discharge 283 m³/s
Basin area 10,032 km²

The Kupa (Croatian) or Kolpa (Slovene) river forms a natural border between north-west Croatia and southeast Slovenia.

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 river Čabranka from the left, before reaching the Slovenian border.

It then continues eastwards, receives influx from the river Lahinja from the left in Primostek, passes Vrbovsko, and eventually detaches from the Slovenian border in 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 Mrežnica).

It continues flowing to the east, where it merges with Glina from the right as well as Odra from the left, and proceeds to the city of Sisak where it flows into the Sava.

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