Francia (river)

 
The Francia () is a 25 km long tributary of the Alagón, a right-hand tributary of the Tagus. Its source is at 1350 m in the Valle de Lera (Sierra de Francia). It flows into the Alagón at a height of 420 m.
The importance of this river lies in the fact that it gives its name to the Sierra de Francia, south of Salamanca. Part of its course falls within the "Las Batuecas-Sierra de Francia Natural Park" protected area.