The beautiful mountain river of Voidomatis in Vikos Aoos National Park, of Northern Greece. Voidomatis is a tributary of the Aoos river, which originates from Tymfi mountain (the summit of which is seen in the b/g), streaming through the Vikos Gorge. This river has been characterized as the “cleanest river” in Europe, as it does not face any environmental issues, flowing through one of the most beautiful unspoiled and pristine natural locations of Greece.