Al-Furqaan 53

وَهُوَ ٱلَّذِى مَرَجَ ٱلْبَحْرَيْنِ هَٰذَا عَذْبٌ فُرَاتٌ وَهَٰذَا مِلْحٌ أُجَاجٌ وَجَعَلَ بَيْنَهُمَا بَرْزَخًا وَحِجْرًا مَّحْجُورًا ﴿٥٣﴾

Wahuwa allathee maraja albahrayni hatha AAathbun furatun wahatha milhun ojajun wajaAAala baynahuma barzakhan wahijran mahjooran

And it is He Who has let free the two seas (kinds of water), one palatable and sweet, and the other salt and bitter, and He has set a barrier and a complete partition between them. The Noble Quran