The Rhône’s tributaries, the rivers that feed the river from the Alps to the Mediterranean

The journey along the river continues: let’s explore together the main tributaries of the Rhône with their unique characteristics, as well as their ecological, historical and geographical importance. From the Swiss Alps to the Mediterranean, travel from the Vispa to the Durance to discover the rivers along the way.

The Rhône river and its tributaries

From the Alps to the Mediterranean, the Rhône weaves a vast network of rivers that shape landscapes, economies and ecosystems. From the glacial Arve to the Provençal Durance, via the Saône and the Ardèche, these major tributaries tell the story of the natural and human history of the regions they cross.

It is considered one of the vital river arteries of both France and Switzerland, playing a major role in the country’s economy, geography and ecology. Over the centuries, the Rhône has always been at the heart of cultural and commercial exchanges between different regions of France and Switzerland.

The Rhône River, one of the main waterways in Western Europe and the backbone of the geography of south-eastern France and western Switzerland, receives a series of major rivers along its long course, enriching its waters and shaping its territories. These tributaries play essential roles, both in terms of biodiversity and human development, and contribute to its flow and power.

Let’s explore the main tributaries of the Rhône together, from Lake Geneva to the Mediterranean, following their history, landscapes, issues and regional impact.

Tributaries of the Rhône

Here is a list of the main tributary rivers of the Rhône, with their average flow rates:

• The Vispa, average flow of 13.4^m3/s at Viège (Visp) in the canton of Valais(Switzerland)
• La Grande Eau, 4.47^m3/s at Aigle, canton of Vaud
• La Venoge, 4.16^m3/s at Ecublens
• The Versoix or Divonne, 3.2^m3/s at its mouth on Lake Geneva
• The Dranse, 19.60^m3/s at Reyvroz in Haute-Savoie(France)
• theArve, 73.90^m3/s at Arthaz-Pont-Notre-Dame
• TheAin, 123^m3/s at the confluence with the Rhône
• Saône, 473^m3/s at Couzon-au-Mont-d’Or in the Lyon metropolitan area
• TheIsère, 333^m3/s at Beaumont-Monteux in the Drôme department
• The Drôme, 20^m3/s at the confluence with the Rhône
• TheArdèche, 65^m3/s at the confluence with the Rhône
• The Durance, 180^m3/s at Mirabeau in the Vaucluse department
• The Gardon or Gard, 32.7^m3/s at Sanilhac-Sagriès in the Gard department

And to complete the picture of the Rhône’s tributaries, here’s a map showing the main rivers that join the Rhône:

• Map of tributaries of the Rhône river

• Other interactive maps of the Rhône river: Tributaries, ports, dams…

Swiss tributaries of the Rhône

A closer look at the main rivers that feed the Rhône and Lake Geneva in Switzerland.

The Vispa river

In the canton of Valais in Switzerland, the Vispa forms in the municipality of Stalden, where the Matter Vispa joins from Zermatt and the Saaser Vispa from the Saas valley. Its short, steep course reflects an Alpine dynamic dominated by snow and glacial melt, with high summer flows and low flows in winter.

The river flows through some of the major tourist corridors in the Valais, while at the same time feeding a network of hydroelectric schemes, reflecting intensive but controlled use of the resource. At Visp, its confluence with the Rhône is part of a plain designed to reduce the risk of flooding and manage solid deposits, a recurring challenge for glacial torrents in Alpine rivers.

The Grande Eau river

Originating in the Diablerets massif, the Grande Eau flows down the Ormonts valley in the canton of Vaud and joins the Rhône at Aigle after a short, steep course. Its rainfall-nival regime, sensitive to storms and accelerated melting, makes it a lively, fast-moving river.

Downstream, the river forms alluvial fans that structure the wine-growing plain and urbanised areas, requiring bank protection and monitoring of alluvial transport during floods. It illustrates the discreet but decisive role played by the small basins of the Pre-Alps in supplying water and sediment to the right bank of the Rhône.

The Venoge river

The Venoge rises in the commune of L’Isle in the canton of Vaud in Switzerland and meanders towards the north shore of Lake Geneva, which it reaches after some forty kilometres. It flows through plateau landscapes, punctuated by local gorges and karstic tributaries, in a basin where agriculture, riverbanks and urbanised areas coexist.

The Versoix or Divonne river

Born on the French side of the Jura, the river is called Divonne upstream, then becomes Versoix in Switzerland before flowing into Lake Geneva through the cantons of Vaud and Geneva. Its short and varied basin, some twenty kilometres long, flows through woodland and wetlands on the outskirts of the city, providing valuable habitats for the biodiversity of Greater Geneva.

Cross-border management involves protecting against rapid flooding, restoring fish continuity and preserving riparian environments under pressure from land development. As with the tributaries of Lake Geneva, its modest but regular inflows have an impact on the ecological and aquatic balance of the lake and the Rhône river.

The Arve River

Downstream of Lake Geneva, the Arve is one of the main tributaries of the Rhône in Switzerland. It rises in the Swiss Alps and flows into the Rhône at Geneva, making a significant contribution to its flow.

Situated between Switzerland and France, the Arve rises in the Swiss Alps, in the Mont Blanc massif on the slopes of the tête de Balme and theAiguillette. It then flows towards the city of Geneva, through the Valais and Haute-Savoie, to join the Rhône at the confluence of the Jonction.

• Map of the Arve route

• Find out more about the Arve, Wikipedia

Tributaries of the Rhône in France

After the Swiss border, blue and grey under the influence of the Arve, the Rhône continues on its way to the next river.

The Dranse river

The Dranse unites the upstream rivers of Dranse d’Abondance, Dranse de Morzine and Dranse de Bellevaux (or Brevon) before reaching Lake Geneva at Thonon-les-Bains in the Dranse delta nature reserve. A mountain stream with significant alluvial deposits, it transfers significant volumes of sediment to the lake, which feeds the 53-hectare delta and the adjoining alluvial groundwater.

Through its flows and solid inputs, the Dranse has an impact on the dynamics of Lake Geneva, of which it is the second largest tributary after the Rhône.

The River Ain

TheAin is a 190-kilometre tributary of the Rhône, rising at Conte in the Jura département. Most of its water comes from the Jura mountains.

The Ain plays an essential role in the local ecosystem, providing a habitat for a wide variety of animal and plant species. It also contributes to the region’s economic development through its water resources, which are used for agriculture, industry and the production of hydroelectric power.

• Map of the Ain route

• Find out more about Ain, Wikipedia ¹

The river Saône

The Saône is the longest of the Rhône’s tributaries, with a total length of 480 kilometres. It rises in the Vosges mountains at the foot of the Monts Faucilles cliffs in the commune of Vioménil and flows through a number of historic French towns, including Chalon-sur-Saône and Mâcon.

It arrives in Lyon to the north of the city, before flowing into its confluence to the south, an important geographical point, where the Confluence museum stands watch between the two banks.

The Saône is a key part of the French river network, linking the Rhône to the Seine watershed.

• Map of the Saône route

• Find out more about the Saône, Wikipedia ²

The Isère river

The 286-kilometreIsère is another Alpine tributary of the Rhône, remarkable for its unique geographical features. It rises in the Galise glacier at the foot of the summit of the Grande Aiguille Rousse in the Alps. Born of Alpine glaciers, it flows through spectacular gorges and narrow valleys above Grenoble before joining the Rhône north of Valence.

Isère has a significant impact on local biodiversity and is home to many endemic species.

• Map of the Isère route

Find out more about Isère, Wikipedia ³

The Drôme river

The Drôme is another of the Rhône’s tributaries, flowing 110 kilometres through a diverse cultural and natural landscape, between the Vercors and Provence. It plays a central role in the history and culture of the region, as evidenced by the many castles and hilltop villages that line its course as far south as the Valence conurbation in the department of the same name.

The environmental challenges facing the Drôme include the preservation of its fragile ecosystem and the sustainable management of its water resources.

• Map of the Drôme route

Find out more about Drôme, Wikipedia

The Ardèche river

The Ardèche, on its right bank, is a tributary of the Rhône. It rises in the Massif Central at the Col de la Chavade in the commune ofAstet and flows into the Rhône near Pont-Saint-Esprit.

The 125-kilometre-longArdèche is a popular river for its tourist potential and exceptional natural wealth. Its spectacular gorges attract hundreds of thousands of visitors every year, who come to enjoy outdoor activities such as canoeing, hiking and climbing.

The conservation of this unique environment is essential to preserving the biodiversity and natural heritage of the Ardèche, in particular the Gorges de l’Ardèche nature reserve.

• Map of the Ardèche route

Find out more about Ardèche ⁴

The Durance river

The Durance, 324 kilometres long, is one of the Rhône’s tributaries and is of strategic importance in terms of water management and sustainable development.

It rises in the French Alps at Pré de Gondran, at the foot of the summit of Les Anges in the commune of Montgenèvre, and flows through several départements in south-east France before emptying into the Rhône at Avignon.

It supplies a large proportion of the water resources in the Provence-Alpes-Côte d’Azur region, in particular for agricultural irrigation, hydroelectric power stations and drinking water. The Marseille canal is a prime example of this, with its 160 kilometres of diversion to the city of Marseille.

Preserving the quality of its water and preventing flooding are major challenges for local players.

• Map of the Durance route

For more information on the Durance, Wikipedia ⁵

The Gardon river

The Gardon is the last major tributary of the Rhône before flowing into the Mediterranean. It is 133 kilometres long and rises at Saint-Martin-de-Lansuscle in the Gard département and the Cévennes massif, before joining the Rhône near Beaucaire.

The river presents specific flooding challenges. Sudden and violent flooding of the Gardon can cause significant damage to infrastructure and homes. Appropriate protective measures, such as reinforcing dykes and setting up weather warnings, are essential to limit the risks associated with these natural phenomena, such as the Cevenol*episode.

• Map of the Gardon route

• For more information on the Gardon, Wikipedia ⁶

The Rhône’s tributariesplay a fundamental role in life around the river, each with their own ecological, historical and geographical characteristics. They shape landscapes, support ecosystems and contribute to the economic development of the areas they cross.

Awareness of their importance and action to preserve them is essential if we are to ensure a sustainable future for these exceptional rivers.

Map of Rhône tributaries

And to finish with some geography, here’s a map of the main tributaries of the Rhône, between Switzerland and France, from the Alps to the Mediterranean:

• Other thematic maps of the Rhône river

Flood and flow monitoring

And to keep track of flooding on the Rhône and its tributaries, visit the dedicated Vigicrues site for the Rhône-Méditerranée basin:

Travel+

• Rhône basin, Wikipedia
• Cevennes, Wikipedia
• Lakes and rivers in the Ardèche
• Maps of the Rhône valley
• IGN maps along the Rhône

1. River L’ain, Wikipedia ↩︎
2. River Saône, Wikipedia ↩︎
3. The Isère river, Wikipedia ↩︎
4. River Ardèche, Wikipedia ↩︎
5. The Durance, Wikipedia ↩︎
6. The Gardon, Wikipedia ↩︎