Some Muslims were saying that this is mentioned in the Quran where it is said:
He has set free the two seas meeting together. There is a barrier between them. They do not transgress. (Quran, 55:19-20)
and
He is the one who has set free the two kinds of water, one sweet and palatable, and the other salty and bitter. And He has made between them a barrier and a forbidding partition. (Quran, 25:53)
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