Cerna
Location
Country	Romania
Counties	Gorj, Caraș-Severin, Mehedinți
Towns	Băile Herculane, Orșova
Physical characteristics
Source	Godeanu Mountains
Mouth	Danube
• location	Orșova
• coordinates	44°44′22″N 22°24′44″E / 44.73944°N 22.41222°E / 44.73944; 22.41222
Length	79 km (49 mi)
Basin size	1,380 km2 (530 sq mi)
Basin features
Progression	Danube→ Black Sea
Tributaries
• right	Belareca

The Cerna (Hungarian: Cserna) is a river in Romania, a left tributary of the river Danube.^[1][2] The Cerna has its source on the south-east side of the Godeanu Mountains and flows into the Danube near the town Orșova.^[3] The upper reach of the river is sometimes called Cernișoara. With a length of 79 km (49 mi) and its basin of 1,380 km² (530 sq mi),^[2] 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, to perpetuate the old toponimic od Dierna.^{[clarification needed]} The upper course of the Cerna is part of the Domogled-Valea Cernei National Park. The Cerna flows through the villages and towns Cerna-Sat, Țațu, Băile Herculane, Pecinișca, Bârza, Topleț, Coramnic and Orșova.

The following rivers are tributaries of the river Cerna (from source to mouth):^[2]

• Left: Arsaca, Jelerău, Valea Mare
• Right: Șturu, Măneasa, Valea Cărbunelui, Valea lui Iovan, Balmez, Naiba, Olanul, Craiova, Iauna, Topenia, Iuta, Prisăcina, Belareca, Jardașița Mare, Sacherștița