Pozo del Amo reserve
|- left||Diablo (river), Navas del Rey|
|- right||Argoza, Bayones, Besaya|
|Source||Northern Sierra del Cordel|
|- elevation||1,700 m (5,577 ft)|
|Mouth||Ría San Martín de la Arena|
|- location||Suances and Miengo, Cantabria, Spain|
|- elevation||0 m (0 ft)|
|Length||67 km (42 mi)|
|Basin||442 km2 (171 sq mi)|
|- average||12.1 m3/s (427 cu ft/s)|
The Saja's source is at 1,700 meters above sea level and it flows rapidly through a steep V-shaped basin during the first kilometers. Past the village of Fresneda the valley starts to open up and it develops a wide alluvial plain in the Cabuerniga valley.
Regarding the ecologic conservation of the river, it is good from the source to the Santa Lucía bridge, from when it begins to show important alterations, and being catalogued as moderately conserved. Down the confluence with the Besaya the alterations are already serious or very serious, being catalogued as badly conserved.
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