A transitional water mass is a discrete and significant element of surface water located near the mouths of rivers or streams, which are partly saline because of their proximity to coastal waters but which are substantially influenced by freshwater currents, constituting the elemental aquatic boundaries destined for the evaluational unit of the DCE. Correspondence DCE reporting: This entity corresponds to the concept of Transitional Water Body (TWBODY) of the WISE.

French Marine Reports unit of european marine's subregions: areas used under the Framework Directive strategy for the marine environment.

French marine's subregions: areas used under the Framework Directive strategy for the marine environment.