The Cerna River is a river in Romania. The Cerna has its source on the south-east side of the Godeanu Mountains and flows into the Danube. The upper reach of the river is sometimes called Cernişoara River. With a basin of 1433 square km and a length of 84 km, 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 Băile Herculane spa.

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