Country France Basin size 1,350 km (520 sq mi) Discharge 15 m³/s Source elevation 1,500 m Mouth Ariège | River mouth Ariège Length 135 km Basin area 1,350 km² Source Pyrenees | |
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Main source Pyrenees
±1,500 m (4,900 ft) Progression Ariège→ Garonne→ Atlantic Ocean | ||
The Hers-Vif ("Live Hers", as opposed to the slower flowing Hers-Mort, "Dead Hers"), also named Grand Hers or simply Hers, is a 135-kilometre (84 mi) long river in southern France, right tributary of the Ariège.
The Hers-Vif rises at an elevation of about 1,500 metres (4,900 ft) near the Chioula Pass of the Pyrenees, approximately 6 kilometres (4 mi) north of Ax-les-Thermes. It is the major tributary of the Ariège into whose right bank it flows 2 kilometres (1.2 mi) upstream from Cintegabelle in the Haute-Garonne.
It flows some 30 kilometres (19 mi) through the Pyrenees, descending 1,100 metres (3,600 ft) to the village of Peyrat, where it reaches a piedmont plain. Its valley widens as it traverses the plain, reaching the medieval city of Mirepoix, which marks the start of its lower valley.
Several rivers flow into it:
Departments and towns along its course are:
Floods
The Hers is probably known as vif (intense or rapid in this context) because of its sometimes spectacular floods – that of 16 June 1289 having entirely destroyed Mirepoix. More recently, there have been: