What is "zelenci"

Zelenci Springs is a nature reserve near the town of Kranjska Gora, in the far northwestern corner of Slovenia. It is the source of the Sava Dolinka River, a tributary of the Danube.

At Zelenci Springs, water from underground Nadiža Creek (originating in the Planica Valley) re-emerges through the porous bottom of a 2 m deep lake, whose waters are noted for their deep, brilliant green. The spring and its surrounding area are named after this colour (Zelenci is a deadjectival plural noun from Slovene zelen 'green'.)