Kupa (Kolpa)
Kolpa at Prelesje
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

Kupa (Slovenian Kolpa) is a river in Croatia and on the border with Slovenia. This article does not cite its references or sources. ... This article needs copyediting (checking for proper English spelling, grammar, usage, tone, style, and voice). ... Sava also Save (in Serbian: Сава; German: Save; Hungarian: Száva) is a river in Europe, a right side tributary of Danube at Belgrade. ... Sisak is a city in central Croatia. ... A drainage basin is the area within the drainage basin divide (yellow outline), and drains the surface runoff and river discharge (blue lines) of a contiguous area. ... This article does not cite its references or sources. ... In hydrology, the discharge of a river is the volume of water transported by it in a certain amount of time. ...

The Kupa originates 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. This article needs copyediting (checking for proper English spelling, grammar, usage, tone, style, and voice). ... Rijeka (in local Croatian dialects Rika and Reka; Fiume in Italian and Hungarian, Reka in Slovene; Sankt Veit am Flaum in older German; R(ij)eka and Fiume both mean river) is the principal seaport of Croatia, located on Kvarner Bay, an inlet of the Adriatic Sea. ... Risnjak National Park (Croatian: Nacionalni park Risnjak) is a national park in Croatia. ...

It then continues eastwards, receives influx from the river Lahinja from the left, passes Vrbovsko, and eventually detaches from the Slovenian border. 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). Vrbovsko is a town and a municipality in western Croatia, situated at the far east of the mountainous region of Gorski Kotar in the Primorje-Gorski Kotar county; on its 280 square kilometers area, Vrbovsko features 60 settlements and 6,047 inhabitants (2001). ... Karlovac (German: Karlstadt or Carlstadt, Hungarian: Károlyváros) is a city and municipality in central Croatia. ... The Dobra is the currency currently in use in the west African island country of Sao Tome and Principe. ... Korana is a river in central Croatia. ...

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. Glina is a commune in the south-east of Ilfov county, Romania. ... Odra is a river in central Croatia. ... Sisak is a city in central Croatia. ... Sava also Save (in Serbian: Сава; German: Save; Hungarian: Száva) is a river in Europe, a right side tributary of Danube at Belgrade. ...