Salsein (; ) is a commune in the Ariège department in the Pyrenees, in southwestern France.
It is located close to Castillon-en-Couserans, about 17 km south-west of Saint-Girons. It is part of the Ariège Pyrenees regional natural park.
The terrain is mountainous. The Bach, Cazalus and Coudères streams run through Salsein.
Population Inhabitants of Salsein are called Salseinois in French.
See also Communes of the Ariège department
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