Nature · The colour of the water
Why the water of the Verdon is green and turquoise
It’s the first thing that strikes you: emerald water in the river, milky turquoise on the lakes. Where does this surreal colour come from? Here is the explanation, simple and verified — and it is this very colour that gave the Verdon its name.
The green of the river
Along its course, the Verdon displays a deep, almost surreal green. This colour comes from fine particles and micro-organisms in suspension — micro-algae and mineral elements (including fluorine) released by the limestone rocks the river flows through from its source, above Allos. The light that penetrates this very pure water is partly absorbed, partly reflected back: the result is this characteristic emerald hue. It is from this that the river takes its name: “Verdon” comes from “vert” (green).
The turquoise of the lakes
On the large reservoirs — Lake Sainte-Croix foremost, but also Castillon or Esparron — the water changes its coat: the green of the river becomes a milky turquoise, lighter and more luminous. The reason? In dam lakes, the water is laden with very fine limestone and clay particles in suspension. These microparticles reflect the light instead of letting it slip away towards the bottom: the water starts to “glow” from within, like a lagoon. The higher the sun and the clearer the water, the more brilliant the turquoise — hence those dreamlike photos in midsummer.
A colour that changes
The colour of the Verdon is never quite the same twice. It depends on the time of day and the season (the low, raking light of morning or evening gives darker greens), on the depth, on the clarity of the water, and on the run-off after rain or dam releases — which can temporarily cloud it. This is what makes every visit unique: the Verdon has a thousand shades of green.
Frequently asked questions
Why is the water of the Verdon green?
The river’s green colour comes from fine particles and micro-organisms present in the water — notably micro-algae and mineral elements (including fluorine) released by the limestone rocks it flows through. It is this emerald hue that gave the river its name: “Verdon” comes from “vert” (green).
Why is Lake Sainte-Croix turquoise?
In dam reservoirs such as Lake Sainte-Croix, the water takes on a more milky turquoise hue than in the river. This is due to fine limestone and clay particles in suspension, which reflect the light: the higher the sun and the clearer the water, the more brilliant the turquoise.
Is the water always this colour?
No, it varies. The colour depends on the light (time of day, season), the depth, the clarity of the water and the run-off after rain or dam releases. In grey weather or after a storm, the green turns darker or murkier; under bright summer sun on the lakes, the turquoise reaches its peak.
Where does the name “Verdon” come from?
From its colour: the river owes its name to its green hue (“verd” in Old Provençal). It is one of the few major rivers of Provence to keep this characteristic emerald colour over much of its course.
Check for yourself
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- Parc naturel régional du Verdonparcduverdon.fr
L'autorité de gestion du territoire : réglementation par milieu (terrestre, aquatique, vertical), bivouac et camping, feu, drone, conseils des écogardes.
- BRGM — service géologique nationalbrgm.fr
Établissement public de référence pour la connaissance du sous-sol français : cartes géologiques, karst et hydrogéologie.
- Office de Tourisme Intercommunal Lacs et Gorges du Verdonlacs-gorges-verdon.fr
Office de tourisme couvrant 16 villages de la rive gauche et des lacs : plages, services et prestataires du secteur.
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