The largest permanent lake in Slovenia, four kilometres long and a kilometre wide, held in a glacial basin at the southern foot of the Julian Alps. The water is cold even in midsummer — a steady 18 to 22 degrees in July and August — and so clear that you can see the bottom in many places near the shore. A flat, easy footpath circles the entire lake; the full loop is about twelve kilometres and takes three to four hours at a relaxed pace.
There are public swimming spots all the way around, the busiest at the eastern end near Ribcev Laz and the quietest along the northern shore, where you can usually find a stretch of pebbly beach to yourself. Rowing boats, stand-up paddleboards and small electric boats are for hire at both ends. Motorised craft are banned. The only village on the lake itself is Ukanc at the western end; the rest of the foreshore is forest and meadow inside the Triglav National Park.