The Krka (; , ; ) is a river in southeastern Slovenia (the traditional region of Lower Carniola), a right tributary of the Sava. With a length of , it is the second-longest river flowing in its entirety in Slovenia, following the Savinja.
The name Krka was first attested in written sources in 799 as Corca (and as Gurke in 1025, and in Gurka fluvio in 1249). The Slovene name is derived from Slavic *, based on the Romance name *Corcra or *Corca, derived in turn from Corcora. Many rivers had this name, or similar names, in antiquity. The name is believed to be of pre-Romance origin and may be based on onomatopoeia.
The Krka sources in a karst spring, lying in a pocket valley below Krka Cave, north of the village of Krka, around southeast of Ljubljana, before flowing southeast. In heavy downpours, water bursts through the main entrance of Krka Cave and flows in a torrential waterfall over the steps in front of it.
The river passes the town of à ½uà ¾emberk, Dolenjske Toplice, the town of Novo Mesto, OtoÃÂec Castle, and Kostanjevica na Krki, to meet the Sava at Breà ¾ice near the Croatian border. Its largest tributary is the PreÃÂna, the continuation of the Temenica River.