1.     In Seas:

Allah (SWT) says: “He has let free (MARAJA) the two sees meeting together. Between them is a barrier that they do not transgress.” (LV: 19-20)

Oceanographers discovered that there were certain differences between water samples taken from various seas in 1284 AH/1873 AD by the British Marine Scientific Expedition of the Challenger Voyage. It was discovered that masses of sea water vary in their composition, in respect of salinity, water temperature, density and types of marine organisms. After 1933 AD another American expedition set out in the Mexican Gulf and installed hundreds of sea stations to study the characteristics of seas. Scientists have found out that the differences in these characteristics distinguish one sea from another. But why do these seas not mix and become homogeneous in spite of the effect of tide and ebb that moves sea water twice a day, and causes seas to move forward and backward turbulently, besides other factors that cause sea water to be in continuous movement and turbulence, such as surface and internal waves and sea currents?

The answer appeared for the first time in scientific books in 1361 AH/1942 AD. Extensive studies of marine characteristics revealed that there are water barriers separating neighboring seas and maintaining the distinctive properties of each sea. After 1962 AD there was known the role of sea barriers in modifying the properties of the water masses that pass from one sea to another, to prevent one sea from overwhelming the other.[1]

Dr Muhammad Nabil says: “When we discussed the Qur’anic text with the American Oceanographer Hill and the German Geologist Professor Schreider, they said unhesitantly that it is definitely Miraculous Divine Knowledge and it cannot be the knowledge of an illiterate simple man that has nothing to do with these sciences.”[2]