Dordogne (river)

The Dordogne () is a river in south-central and southwest France. The Dordogne river and its drainage basin was named as a Biosphere Reserve by the UNESCO on 11 July 2012.
Geography.
The Dordogne has a length of , and a drainage basin with an area of approximately .
Its average yearly discharge (volume of water which passes through a section of the river per unit of time) is 274 cubic metres per second at Bergerac.
Average monthly discharge (m3/s) at Bergerac (1958-2011)
Course.
The Dordogne starts on the sides of the Puy de Sancy, Massif Central, in the "commune" of Mont-Dore, Puy-de-Dôme department, at an elevation of about .
It flows generally west through the Nouvelle-Aquitaine region and the Dordogne department before flowing into the Gironde where it joins, in the north of the city of Bordeaux, the Garonne river to form the Gironde estuary, at about of altitude.
The Dordogne flows through 4 regions, 6 departments and 173 "communes". The main "communes" are:
Main tributaries.
The main tributaries (more than 50 km long) of the Dordogne river are:
Left tributaries:
Right tributaries: