River basin organisations are official organisations set up by political authorities or in response to stakeholders’ demands or legal requirements. As administrative and hydrologic perimeters do not coincide in most cases, a diversity of situations can be observed in terms of how many RBOs operate within a city’s perimeter (from one to more than three, see Figure 3.6). River basin organisations carry out different water-related tasks such as monitoring (85%), data collection (81%), as well as co-ordination, planning and stakeholder engagement (above 60%).