Wild Lake (Slovene: Divje jezero) is a lake near Idrija in western Slovenia and a karst spring of the Vauclusian type. The lake is the source of the Jezernica River, a tributary of the Idrijca and, at 55 metres (180 ft) long, the shortest river in Slovenia. Water flows from under the ground and through a steeply inclined tunnel, explored to a depth of 160 metres (520 ft). The discharge occasionally surpasses 60 cubic metres per second (2,100 cu ft/s). However, when the water level is low, there is no outflow from the lake. In 1967, the lake was protected as a natural monument. In 1972, it was arranged to be the first Slovenian natural museum.
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