The hydrographic division is l' all of the four hierarchical partitions of the French territory made according to decreasing hydrographic areas:
— hydrographic region (1st order),
— hydrographic sector (2nd order),
— hydrographic subsector (3 rd order),
— hydrographic area (4th order).
A sector is divided according to a maximum of 10 subsectors and one subsector is divided according to a maximum of 10 river basin areas.
The definition of subsectors and their limits is the responsibility of the Water Agencies.
__Origin__
Updated by l'IGN following requests from Agences de l'Water according to an annual cycle. The consolidated version is then sent to the Sandre
__Partner organisations__
Ash, Agence de l'eau Adour-Garonne, Agence de l'eau Artois-Picardie, Agence de l'eau Loire-Bretagne, Agence de l'eau Rhine-Meuse, Agence de l'Rhone-Méditerrannée water and Corsica, Agence de l'eau Seine-Normandie
__Links annexes__
* [see scenario d' geographical exchange of the hydrographic reference](http://www.sandre.eaufrance.fr/urn.php?urn=urn:sandre:scenario-d-echanges-geographique:eth:FRA:::ressource:1:)
* [see Dictionary & Hydrographic Reference (ETH)"](http://www.sandre.eaufrance.fr/?urn=urn:sandre:notice:dictionnaire::theme:ETH:ressource:2002-1:::html)
[See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/f08ad6a22122d19f69d85a44717b18eb03d653c6)
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