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 created in 1790 from districts of Castres, Albiand, and Lavaur belonging to the province of Languedoc. In 1906, the residents were 330,533. Tarn's three chief ranges are nearby the south-east are: the Mountains of Lacaune, Montagne Noire, and the Sidobre, the belonging to the Cevennes. On the southern boundary of the department the Montagne Noire instigates its name from the forests on its northern slope, and some of the mountains are from 3000 to 3500 ft high.

Tarn is a subdivision of south-western France, formed in 1790 from districts of Castres, Albiand, Lavaurbelonging, belonging to the province of Languedoc. Its inhabitants are 330,533 and the area occupied is 2231 sq. m. Tarn is bounded by northern side and at the eastern side by Aveyron, at south eastern side by Herault, and northeren side by Aude, south western side and western side by Haute-Garonne, north western side by Tarn-et-Garonne. From east to west is the slope of the department and its general character is rocky or hilly; its three major ranges include the Sidobre, the Montagne and Noire the Mountains of Lacaune, going to the Cevennes, lie on the south-east.