This chapter analyses the norms and principles concerning the management of transboundary waters under international law, as well as the provisions of the Water Framework Directive on the same issue under European Union law. Then, the focus is moved to the hydrographical situation of Italy and the waters the country shares with neighbouring States. Even though, unlike other European countries, Italy does not share major watercourses or water bodies with other States, in at least a couple of cases (Lake Maggiore and Lake Lugano shared with Switzerland, and River Isonzo/Soča shared with Slovenia) joint management and control systems are in force, which pre-date the WFD by many years.