Hydrographic Regions — Métropole 2016 — CD Carthage

The hydrographic division is the set of four hierarchical partitions of the French territory carried out according to descending hydrographic areas:
— hydrographic region (1st order),
— hydrographic sector (2nd order),
— hydrographic subsector (3 rd order),
hydrographic area (4th order).
A hydrographic region is divided into a maximum of 10 sectors.
The list of hydrographic regions was adopted in Circular No. 91-50 of 12 February 1991 but the determination of their boundaries is under the responsibility of the Water Agencies.