The Cerna is a river in Romania, a left tributary of the river Danube. The Cerna has its source on the south-east side of the Godeanu Mountains and flows into the Danube near the town Orșova. The upper reach of the river is sometimes called Cernisoara. With a length of 79 km and its basin of 1,380 km2, it carves an erosive tectonic valley with numerous gorges, quite deep sometimes. There is a man-made lake on it - Tierna, just before it crosses the Baile Herculane spa, to perpetuate the old toponimic od Dierna. The upper course of the Cerna is part of the Domogled-Valea Cernei National Park.

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拍攝者： Rechitansorin