The Duerna is a river in the province of León, Spain. It begins at the convergence of the Cabrito and Ballina streams, in the town of Pobladura de la Sierra, in the Lucillo municipality.

Duerna Latin: Ornia
Watershed of the Duerna at Priaranza de la Valduerna (Maragatería)
Location
Country	Spain
Physical characteristics
Source	Union of the streams Cabrito and Ballina
• location	Pobladura de la Sierra, Lucillo, Maragatería, León, Castile and León, Spain
• elevation	1,120 m (3,670 ft)
Mouth	Tuerto river
• location	Requejo de la Vega, Soto de la Vega, Tierra de La Bañeza, León, Castile and León, Spain
• elevation	775 m (2,543 ft)
Length	54 km (34 mi)
Basin size	317 km2 (122 sq mi)
Basin features
Tributaries
• left	Peces
• right	Espino, Llamas

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