Translate the following English sentence to French:
"I must say, however, that, there are discrepancies between the countries in the north and south concerning water, and that is why the matter cannot be dealt with in the same way."
Il me faut toutefois faire observer qu' il existe des disparités entre les pays du Nord et ceux du Sud sur la question de l' eau, et c' est pourquoi celle-ci n' appelle pas un traitement identique.