The Lot river rises in the Cévennes, flowing west through Quercy. It flows into the Garonne near Aiguillon after 480 km. The Garonne river rises in the Val d'Aran in the Spanish Pyrenees. After 575 km it meets the Dordogne and forms the Gironde estuary.
Both rivers are important for the underground sights of the département, as they cut through karstified limestone hills with many caves. In the Stone Age they were important hunting grounds for our ancestors, a steppe or grassland used by huge herds of Pleistocene animals for their annual migrations. This area was not covered by the glaciers, it was in the middle of a corridor enclosed by glaciers from the north and south, but not covered by glaciers.
The geographic regions are named after the rivers which form the center of the respective region, the Lot, the Dordogne, the Vezere. This region is the lower part of the Lot river, which actually overlaps with the political borders of Département Lot-et-Garonne.