The Reka (literally, 'river' in Slovene), also the Inner Carniola Reka (),Lazar, Jože. 1975. Razširjenost sladkovodnih alg v Sloveniji. Ljubljana: SAZU, p. 13.Hrvatin, Mauro, Helena Dobrovoljc, Jerneja Fridl, Janez Mulec, & Miha Pavšek. 2008. Kras. Ljubljana: ZRC, p. 35. is a river that starts as Big Creek () in Croatia, on the southern side of Mount Snežnik, and flows through western Slovenia, where it is also initially known as Big Creek ().Perko, Drago, & Milan Orožen Adamič. 1998. Slovenija: pokrajine in ljudje. Ljubljana: Mladinska knjiga, p. 251. The river is long, of which is in Slovenia. At the village of Škocjan it disappears underground through Škocjan Caves, flowing underneath the Slovenian Karst. The river continues as part of the Timavo in Italy. Tracer studies have shown that it also feeds springs elsewhere on the Adriatic Coast between Trieste and Monfalcone.LTER Slovenia summarizes the science performed to date: http://lter.zrc-sazu.si/ProjectOverview/tabid/350/Default.aspx It has a pluvial regime.
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Condition of Reka at Cerkvenikov Mlin and Škocjan - graphs, in the following order, of water level and flow data for the past 30 days (taken by ARSO)