Zelenci

In retreat, the bulk of it was deposited at what is now Podkoren, damming the Sava with the Koren Pass, which hemmed in glacial melt and formed an extensive lake.

The Sava then tunneled through this natural dam, lowering the water level of Lake Koren until only Zelenci Springs and its surrounding wetlands were left.

The porous chalk of the Zelenci Springs lake bed allows the constant upwelling of groundwater in the form of tiny jets, a phenomenon unique in Slovenia.

Sir Humphry Davy, the Cornish naturalist and a visitor to the area in the 19th century, wrote of it:[3] "The valley of the Save, with its cataracts and lakes, particularly struck me.

The surroundings of the spring are hospitable to plant life adapted to riparian habitats: carex, alder, and willows, and an assortment of flowering plants: In addition to trout, which inhabit the lakes and feed on mayfly (Ephemeroptera) and stonefly (Plecoptera) larvae, the area has several endangered species on the Red List of Endangered Animal Species of Slovenia: