In the lower part of its course, from the Bec-dAnibez, where it receives the Dordogne, it becomes considerably wider, and takes the name of Gironde.
The principal affluents are the AriCge, the Tarn with the Aveyron and the Agout, the Lot and the Dordogne, which descends from Mont Dore-lesBains, and joins the Garonne at Bec-dAmbez, to form the Gironde.
The three principal regions for the production of tobacco are the basin of the Garonne (Lot-et-Garonne, Dordogne, Lot and Gironde), the basin of the Isre (Isre and Savoie) and the department of Pas-de-Calais.
Entering the department of Lot, it abandons a south-westerly for a westerly course and flowing in a sinuous channel traverses the department of Dordogne, where it receives the waters of the Vezere.
The name is taken from that of a Gallic tribe, the Cadurci, and was applied to a small district watered by the Dordogne, the Lot and the Tarn.