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 di Arbus coarse hand-woven cloth, from which two traditional Sardinian garments are made: "sa mastrucca", the overcoat worn by shepherds; and "su sacu", a heavy waterproof blanket. Nera di Arbus The Nera di Arbus, more fully Pecora Nera di Arbus ("black sheep of Arbus"), is a breed of small domestic sheep indigenous to the Mediterranean island of Sardinia, Italy. It takes its name from the comune of Arbus, in the province of Medio Campidano, in the south-western part of the island. It is raised in the provinces of Cagliari, Nuoro, Oristano and Sassari. The breed achieved official recognition in 2008. The Nera