High Quality Content by WIKIPEDIA articles! Saint-Affrique-les-Montagnes is a commune in the Tarn department in southern France. Tarn is a department of 5,758 km2 in the Midi-Pyrénées region in the southwest of France, named after the Tarn River. It was formed in 1790 of the three dioceses of Albi, Castres and Lavaur, belonging to the province of Languedoc. In 1906, the population was 330,533. In 1999, it stood at 343,402. Of particular note in the department are Albi (the capital), Castres, Gaillac, Lavaur, Mazamet and Cordes.