The Imbours cascade is a natural phenomenon, formed by the erosion of limestone rocks by the waters of the Imbours stream.

Here was most certainly celebrated the Celtic god Borvo (healing divinity of boiling water) which gave its name to the creek and domain of Bours (and Imbours).
Surrounded by many prehistoric and ancient burials (tumulus and funeral dolmens), this place bears witness to several millennia of human attendance and activity.
Very active in winter and the following days of rain, the source of Fond-Grand (at 600m.) once permanent, is dried up in summer and gives way to an island of greenery bathed by limestone gours.