The Reka (literally, 'river' in Slovene), also the Inner Carniola Reka (), is a river that starts as Big Creek () in Croatia, on the southern side of Mount Sneà ¾nik, and flows through western Slovenia, where it is also initially known as Big Creek (). The river is long, of which is in Slovenia. At the village of à  kocjan it disappears underground through à  kocjan 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. It has a pluvial regime.