Bismillah

وَهُوَ الَّذِي مَرَجَ الْبَحْرَيْنِ هَـٰذَا عَذْبٌ فُرَاتٌ وَهَـٰذَا مِلْحٌ أُجَاجٌ وَجَعَلَ بَيْنَهُمَا بَرْزَخًا وَحِجْرًا مَّحْجُورًا

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. (25:53)

مَرَجَ الْبَحْرَيْنِ يَلْتَقِيَانِ بَيْنَهُمَا بَرْزَخٌ لَّا يَبْغِيَانِ فَبِأَيِّ آلَاءِ رَبِّكُمَا تُكَذِّبَانِ

He has let loose the two seas (the salt and fresh water) meeting together. Between them is a barrier which none of them can transgress. Then which of the Blessings of your Lord will you both deny? (55:19:21)

Click HERE to see the meeting point of the Nile River and the Mediterranean Sea. SubhanAllah. (courtesy of fajr.wordpress.com)

This is the creation of Allah. So show Me that which those (whom you worship) besides Him have created. Nay, the wrongdoers (those who do not believe in the Oneness of Allah) are in plain error. (31:11)