 The establishment of this band around the entire island caused the expression to lose its initial meaning by distancing the lower limit of the concessions from the "battant des lames".Since ravines were often formed by the union of several thalwegs upstream, the choice of which tributary to keep as the boundary marker between plots of land up high was not always easy and often led to disputes.This problem was aggravated by the fact that some of the ravines in question had several names, which made for a possible source of confusion.