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Cidacos River
Cidacos river in Arnedo (La Rioja).
Cidacos river location in the Ebro basin
Native name	Río Cidacos (Spanish)
Location
Country	Spain
Region	Castile and León Soria, La Rioja
Physical characteristics
Source
• location	Puerto de Oncala
• elevation	1,425 m (4,675 ft)
Mouth
• location	Ebro
• elevation	290 m (950 ft)
Length	82.8 km (51.4 mi)
Basin size	696 km2 (269 sq mi)
Discharge
• average	2.7 m3/s (95 cu ft/s)
Basin features
Progression	Ebro→ Balearic Sea

The Cidacos River is a tributary of the Spanish Ebro River.^[1] Its source is Los Campos, in Soria, and it flows for 77 kilometres (48 mi) until it reaches the Ebro at Calahorra, La Rioja.

It flows through or past various towns like Villar del Río, Yanguas, Enciso, Peroblasco, Arnedillo, Santa Eulalia Somera, and Bajera, Herce, Arnedo, Quel, Autol, and Calahorra. The river is used for irrigation purposes and is often dried up near Calahorra.

• 
  The Cidacos near Autol
• 
  Bridge over the Cidacos near Arnedillo

• List of rivers of Spain

42°12′38″N 2°12′21″W / 42.21056°N 2.20583°W / 42.21056; -2.20583