Enns (river) below the Enns"). Finally, it meets the Danube at Mauthausen and the city of Enns. The Enns is a typical wild water river and draws its water from an area of more than , which is the fifth-largest in Austria. The average outflow at its mouth is . The Anisian Age in the Triassic Period of geological time is named from Anisus, the Latin name of the river Enns. In the middle of the 19th century, canals began to be built along the between Weißenbach and the Gesäuse, in order to make use of the water for agriculture and forestry.
Nera Gorge-Beușnița National Park represents a mountainous area (mountain peaks, cirques, crevasses, caves, valleys, canyon s, waterfalls) what shelters a large variety of flora and fauna; some of the species are endematic or very rarely. Protected areas included in the park: "Nera Gorge-Beușnița, Șușara Gorge, Ducin, Izvorul Bigăr, Izvoarele Nerei, Lisovacea" and "Valea Ciclovei-Ildia". Climate is a temperate continental, with moderate winters, warm summers, low thermal amplitude, with rich rainfall, with Mediterranean influences. The hydrological network includes Nera River and its tributaries: Coşava, Bănia, Beu, Ducin, Miniş, Nergana, Nerganiţa, Prigor, Rudăria, and Şopotu. On the territory of the protected area it has been identified