۞ وَهُوَ ٱلَّذِي مَرَجَ ٱلۡبَحۡرَيۡنِ هَٰذَا عَذۡبٞ فُرَاتٞ وَهَٰذَا مِلۡحٌ أُجَاجٞ وَجَعَلَ بَيۡنَهُمَا بَرۡزَخٗا وَحِجۡرٗا مَّحۡجُورٗا

Wa Huwal lazee marajal bahraini haazaa 'azbun furaatunw wa haazaa milhun ujaaj; wa ja'ala bainahumaa barzakhanw wa hijran mahjooraa

It is He Who has let free the two bodies of flowing water: One palatable and sweet, and the other salt and bitter; yet has He made a barrier between them, a partition that is forbidden to be passed.

— Al-Furqan (ٱلْفُرْقَان), 25:53