Al-Furqaan 25:53

It is He Who merges the two bodies of water: one fresh and palatable and the other salty and bitter, and He has made between them a barrier and an insurmountable partition[29].

[29] When salt and fresh waters meet, although both mix together, each still keeps its distinctive qualities, as if a barrier prevents them from mixing completely.

And it is He who has released [simultaneously] the two seas [i.e., bodies of water], one fresh and sweet and one salty and bitter, and He placed between them a barrier and prohibiting partition.

53. And it is He Who has let free the two seas (kinds of water): this is palatable and sweet, and that is salt and bitter; and He has set a barrier and a complete partition between them.

And He it is Who hath given independence to the two seas (though they meet); one palatable, sweet, and the other saltish, bitter; and hath set a bar and a forbidding ban between them.