The invention relates to a white-water river, comprising a river bed capable of guiding a current of water between an upper inlet of the bed and a lower outlet of the bed, and including water-feeding means for injecting a stream of water at the upper inlet of the bed. The river bed is made up of a series of individual bed modules, adjacent to one another, and assembled via respective transverse contact surfaces. The individual bed modules are supported via a lower surface by a modular lattice bearing structure.