International Watercourses: Between the Division and the Border Unit

It is important to show that frontiers are not just set by land borders but also by watercourses. This takes relevance when rivers run between States without regard to the territorial delimitation. For that reason, it is important to show how this inevitable change in the course of the waters must be analyzed from a political, geographical, and economic perspective. With this purpose, this chapter will show a theoretical axis about watercourses, how international law interferes with this theme, its prohibitions, some cases about the legal protection to the watercourses and the human right to water before the watercourses; conclusions will be given at the end.