Nera (Danube) basin and it is not navigable. After the filling of the artificial Lake Đerdap, as a result of the Iron Gate I Hydroelectric Power Station which was finished in 1972, the mouth of the river into the Danube was flooded. In order to allow the optimal electricity production, the water level of the Nera at the mouth should not go below , while it must not exceed it if the flooding of the banks is to be avoided. Since the mid-1990s, there are significant problems in fixing the river's level, as the process is costly and complicated. In 2018, representatives
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