Il importe également de souligner la difficulté de recenser l’ensemble des sources de pollution, notamment en milieu estuarien, sises au débouché de bassins-versants d’une très grande superficie drainée par les fleuves.
It is also important to underline the difficulty of compiling an inventory of all sources of pollution, particularly in estuaries, which are located at the outlets of very large catchment areas drained by rivers.
