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
Piccola nera to make varietal wines. Ampelographers believe that Piccola nera originated in the border region between Italy and Slovenia in what is now the province of Trieste in Italy and the Obalno-kraška Statistical Region of Slovenia. In Italian, the name "Piccola nera" can be translated to mean "little black" which describes the small black skin berries of the grape vine. Piccola nera is a late ripening grape variety that can be very vigorous and high yielding if not kept in check by winter pruning and later green harvesting during the growing season. In the Trentino-Alto Adige/Südtirol wine region of Italy, the