The stream you have crossed comes from the Cives combe. It is joined by another stream from the Risoux slopes (the mountain looming over you). After travelling underground, the stream surfaces near Morez, around ten kilometres from here. From there to here, it passes through the peat bog, with the latter acting like a sponge during rainy weather and when snow starts to melt. By doing so, the peat bog limits flooding, and then gradually returns the water during dry periods. Its last function is to purify the water running through it by acting as a filter.