The Quran on Seas and Rivers

Modern Science has discovered that in the places where two different seas meet, there is a barrier between them. This barrier divides the two seas so that each sea has its own temperature, salinity, and density. For example, Mediterranean sea water is warm, saline, and less dense, compared to Atlantic ocean water. When Mediterranean sea water enters the Atlantic over the Gibraltar sill, it moves several hundred kilometers into the Atlantic at a depth of about 1000 meters with its own warm, saline, and less dense characteristics. The Mediterranean water stabilizes at this depth.

The Mediterranean sea water as it enters the Atlantic over the Gibraltar sill with its own warm, saline, and less dense characteristics, because of the barrier that distinguishes between them.  Temperatures are in degrees Celsius (C°). (Marine Geology, Kuenen, p. 43, with a slight enhancement.)

Although there are large waves, strong currents, and tides in these seas, they do not mix or transgress this barrier.

Let's see what ALLAH said about this in Quran:

"He has set free the two seas meeting together. There is a barrier between them. They do not transgress."

(Qur’an, 55:19-20)

This information has been discovered only recently, using advanced equipment to measure temperature, salinity, density, oxygen dis-solubility, etc. The human eye cannot see the difference between the two seas that meet, rather the two seas appear to us as one homogeneous sea.

So how can an ordinary man (of course born with normal eyes) can give information like this if He had not ever went to sea to observe this. Even at that time, if someone had gone to sea, he would not be able to give this much detail about this information.