Vipava at Renče (Christmas dive)
A weir on the Vipava at Renče slows the river and deepens it to over 6 m under the old road bridge, with a 7 m pool just upstream. In January and February, at low water, a group of giant wels catfish – some over 2 m long – overwinters in that pool, and divers sometimes meet a dozen of them. Elsewhere there are few fish apart from carp coming in from the weedy shallows, and the gravel bed holds debris including remains of old bridges and the First World War. Every December the local club DPD Soča holds a festive Christmas dive here with an underwater treasure hunt.
depth: 0–7 m