The Saja is a 67 km long river in the autonomous community of Cantabria, northern Spain. It flows into the Cantabric sea. 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. Past the village of Fresneda the valley starts to open up and it develops a wide alluvial plain in the Cabuerniga valley.
