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
CountrySpain
Physical characteristics
SourceUnion of the streams Cabrito and Ballina
 • locationPobladura de la Sierra, Lucillo, Maragatería, León, Castile and León, Spain
 • elevation1,120 m (3,670 ft)
MouthTuerto 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)
Length54 km (34 mi)
Basin size317 km2 (122 sq mi)
Basin features
Tributaries 
 • leftPeces
 • rightEspino, Llamas

42°18′36″N 5°53′46″W / 42.3100°N 5.8961°W / 42.3100; -5.8961