Area of land and sea, made up of one or more neighbouring river basins together with their associated groundwaters and coastal waters, identified under Article 3(1) of Directive 2000/60/EC as the main unit for management of river basins.
SOURCE: Art 2 (15) of DIRECTIVE 2000/60/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 23 October 2000 establishing a framework for Community action in the field of water policy.
NOTE: A river basin district can either be an international or national river basin district or a sub unit of management.
NOTE 2: The relatedZone role should be used to link river basin districts. For example, a national river basin district should include a relatedZone attribute linking it to the international river basin district.