Le 6 août 2023
Après la découverte de la magnifique et méconnue chapelle troglodyte Saint-Michel 5 ans plus tôt
http://deprovenceetdailleurs.net/2018/09/au-fil-du-tuf.html
retour sur les rives de l’Argens pour y découvrir en randonnée le vallon Sourn sous les falaises de Châteauvert bien connues des grimpeurs, puis le Pont de Saint-Sumian en amont, au départ de la Chute du Tombereau (puisque l’accès par le hameau de la Cloche est interdit…). C’est toujours surprenant de parcourir la Provence verte - des rivières serpentant dans une dense forêt de feuillus - à seulement quelques dizaines de kilomètres de la garrigue clairsemée et rocailleuse de l’ouest des Bouches-du-Rhône. Le pont de Saint-Sumian, vestige de l’époque gallo-romaine, vaut le détour avec ses soutènements couverts de tuf au-dessus des eaux vertes de l’Argens, et son canal ou grotte traversante de part et d’autre de la rivière.
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le vallon Sourn juste en aval de Châteauvert
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le pont gallo-romain de Saint-Sumian et ses formations de tuf au-dessus de l'Argens
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le canal secondaire rive gauche et le tunnel traversant rive droite
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