The Vâlsan is a left tributary of the river Argeș in Romania.

[2] The Vâlsan originates in the Făgăraș Mountains, where its source is a trough-shaped glacial hollow located between the Picuiata and Scărișoara Mare mountains.

[4] In 1967 the Vâlsan's course was altered significantly by the construction of a reservoir and a hydroelectric plant.

This is because it is one of the few rivers that supports the fish species Romanichthys valsanicola.

This article related to a river in Argeș County is a stub.