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 (Danube) Mountains. In this section, the Nera receives its left tributary, the Rudăria, and passes next to many villages (Prilipeț, Dalboșeț, Moceriș), until it reaches Șopotu-Nou, where it sharply turns to the northwest, still curving around the Semenic mountains. It passes next to the villages of Sasca Română, Sasca Montana, Slatina Nera and Naidăș, at which point it becomes the border between Romania and Serbia for the remaining . In the border section, the Nera flows through the depression of Bela Crkva (Belocrkvanska kotlina; Cyrillic: Белоцркванска котлина), and settlements on the Romanian side include Lescovița, Zlatița and Socol, while on the