From the Wikipedia page 
Tarn-et-Garonne (French pronunciation: [taʁneɡaʁɔn], Occitan: Tarn e Garona ['taɾe ga'ɾɔnɔ]) is a department in the southwest of France. It is traversed by the Rivers Tarn and Garonne, from which it takes its name. This area was originally part of the former provinces of Quercy and Languedoc. The department was created in 1808 by Napoléon Bonaparte, with territory being taken from the departments of Lot, Haute-Garonne, Lot-et-Garonne, Gers and Aveyron. The department is mostly rural with fertile agricultural land in the broad river valley, but there are hilly areas to the south, east and north. The departmental prefecture is Montauban, and some of the other large communes include Castelsarrasin, Molières, Caussade, Valence-d'Agen and the medieval town of Lauzerte.