Tarn (river) facts for kids

Kids Encyclopedia Facts
The Tarn river at Albi
Country France
Region Occitanie
Departments Lozère, Aveyron, Tarn, Haute-Garonne, Tarn-et-Garonne
Communes Le Pont-de-Montvert, Millau, Albi, Gaillac, Villemur-sur-Tarn, Montauban, Moissac
 - left Tarnon, Jonte, Dourbie, Cernon, Dourdou de Camarès, Rance, Agout
 - right Muze, Alrance, Tescou, Aveyron, Lemboulas
Cities Millau, Albi, Montauban, Saint-Juéry, Gaillac, Moissac
Source Cévennes
 - location Mont Lozère, Massif Central, France
 - elevation 1,560 m (5,118 ft)
 - coordinates 44°24′54″N 3°48′51″E / 44.415°N 3.81417°E / 44.415; 3.81417
Mouth Garonne
 - location Moissac, Tarn-et-Garonne, France
 - elevation 65 m (213 ft)
 - coordinates 44°05′11″N 3°48′51″E / 44.08639°N 3.81417°E / 44.08639; 3.81417
Length 381 km (237 mi)
Basin 15,700 km² (6,062 sq mi)
Discharge for Moissac
 - average 233 /s (8,228 cu ft/s)
Wikimedia Commons: Tarn River

The Tarn is a river in southern France, tributary of the Garonne river. The Tarn and Tarn-et-Garonne departments are named after this river.


The Tarn river has a length of 380.6 km (236.5 mi) and a drainage basin with an area of 15,700 km2 (6,062 sq mi).

Its average yearly discharge (volume of water which passes through a section of the river per unit of time) is 233 cubic metres per second at Moissac, near the confluence with the Garonne, in the Tarn-et-Garonne department.


The source of the Tarn is on the Mont Lozère, in the Cévennes, southeastern Massif Central, in the commune of Le Pont-de-Montvert, Lozère department, at an altitude of about 1,560 m (5,118 ft).

The Tarn flows to the southwest, in general, and passes through the following regions, departments and communes:

The Tarn river flows through a total of 104 communes.

Finally, it flows, as a right tributary into the Garonne near Moissac, in the Tarn-et-Garonne department, at 23 m (75 ft) of altitude.

Main tributaries

Tarn-Garonne confluence
Confluence of Tarn and Garonne rivers near Boudou

The main tributaries, with a length greater than 25 km, of the Tarn are:

  • Left tributaries
    • Tarnon - 38.9 km;
    • Jonte - 38.6 km;
    • Dourbie - 30.4 km;
    • Cernon - 30.4 km;
    • Dourdou de Camarès - 86.8 km;
    • Rance - 63.5 km;
    • Agout - 194.4 km;
  • Right tributaries
    • Muze - 29.4 km;
    • Alrance - 26 km;
    • Tescou - 48.8 km;
    • Aveyron - 290.7 km;
    • Lemboulas - 56.7 km;


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Tarn (river) Facts for Kids. Kiddle Encyclopedia.