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 Piccola nera Piccola nera is red Italian and Slovenian wine grape variety that is grown in the province of Trieste within the Friuli-Venezia Giulia wine region and across the border in neighboring Slovenia where ampelographers believe that the grape originated. Piccola nera, whose name means "little black", tends to produce to light bodied red and rosé wines that are meant to be consumed young. It is a permitted variety in the "Denominazione di origine controllata" (DOC) wines of Carso where it is usually blended with Terrano and in Venezia "Indicazione geografica tipica" IGT classification where the grape can be used