a department of France, lying between N. Lat. 43. 25, and 44. 12., E. Long. 1. 30. and 2. 55.; bounded on the N. and N.E. by that of Aveyron, S.E. by Hérault, S. by Aude, and W. by Haute-Garonne and Tarn-et-Garonne. Length from N.W. to S.E. 65 miles; breadth 46; area 2218 square miles. It is in general a hilly or undulating country, as its south-eastern part is traversed by the chain of the Cevennes, and the north-western by a branch running parallel to it; while between these there are various smaller ridges, and many fine plains. The chief river is that from which it derives its name, an affluent of the Garonne. It flows through the department from east to west near its centre, and it receives the Aveyron, the Tescon, and the Agout; the first of which forms the north-west boundary of the department, while the others flow within its bounds. Of these rivers, the Tarn and the Aveyron are navigable here for some distance. In the east of the department, the country consists chiefly of granitic and other primary or early secondary formations; while in the west the tertiary strata are more prevalent. Coal, iron, lead, copper, and other minerals are found here; and coal and iron are worked to some extent. The soil is generally good, and some of the plains and valleys are not surpassed in fertility by any part of France. The department also enjoys a mild and healthy climate. But agriculture is in a very backward condition, although corn is produced in sufficient abundance, not only for home consumption but for exportation. Of the entire area, about 112,000 acres are occupied by arable ground, and nearly 200,000 by heaths, waste land, &c.; the rest of the department consisting of forests and vineyards, of which the former cover 200,000, and the latter nearly 80,000 acres. Wheat, barley, rye, oats, maize, and buckwheat are the principal crops raised. A large quantity of wine is also produced; but it is not much valued, and is chiefly used for making brandy. Pulse, potatoes, flax, hemp, wood, anise, coriander, and saffron, are among the other productions of the country. Large numbers of live stock are reared in the department, especially sheep and swine; the veal of this department is highly valued, and the horses are much sought after for the light cavalry. It is estimated that Tarn contains 10,000 horses, 10,000 mules and asses, 90,000 horned cattle, 580,000 sheep, 75,000 pigs, and 4000 goats. Fowls are numerous; and the rearing of bees is extensively carried on. Of wild animals, there are found here the wolf, the fox, the wild-boar, the roebuck, the badger, &c. The manufacturing industry of the country consists chiefly in the making of steel, broadcloth, hosiery, and brandy. A considerable trade is carried on, the chief articles exported being—corn, wine, fruit, cattle, anise, wood, coriander, and manufactured articles. The capital of the department is Albi, from which the country was anciently called Albigeois. It is divided into 4 arrondissements, 35 cantons, and 315 communes, and contained in 1856, 834,832 inhabitants.