What geographical feature is the administrative unit for water pollution control int he european union?

seacoast
city
river basin
nation

The administrative unit for water pollution control in the European Union's geographical feature is the river basin. The European Union introduced a new model for water pollution control which is the River Basin Management. The European Union thought that this system is the most efficient system for controlling the water pollution. This system tends to manage the pollution from the river basin.

Yes yes yes very good