For WISE 2016 : only one subunit is reported per district and is an identical object to the corresponding district
River basin district corresponds to a national river basin district (example: rivers of Corsica)) or a portion of an international river basin district situated on the territory of a Member State (examples: Meuse, Sambre)
River basin district is the main unit for management of river basins and is represented cartographically by the aggregation of sub-basins component.
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