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 Verzasca and 365 l for pluriparous, nannies; a study in 2008–10 found an average yield of 373 litres in 208 days, with an average of 3.50% fat and 3.06% protein. In Italy the milk is used to make caprino cheeses such as Formaggella del Luinese, which has DOP status, while in Switzerland much of it is made into Büscion, a fresh goat's-milk cheese; ricotta is made in both areas. Kids are slaughtered at an average age of 41 days, at an average weight of 14 kg. Nera Verzasca The Nera Verzasca, also known as the Nera di Verzasca or Verzaschese, is