Lukenjska jama (cave below Luknja castle) – sump
A periodic spring cave in the Luknja pocket valley near Prečna, where the Temenica resurfaces. A siphon lake between the passage and the inner hall spews water in rain and floods the cave. Divers explored the sump in 1997: after almost 50 m it led into a beautifully decorated passage that ends after 100 m in another sump lake. The cave is also a Palaeolithic site and an important bat refuge.
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