The Saja is a river in the autonomous community of Cantabria, northern Spain.

Part of its course is inside the Saja-Besaya Natural Park 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.

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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