The Lowest Area on Earth
Allah, the Almighty, says: [AlifLamMim. The Romans have been defeated in the lowest land, and they, after their defeat, will be victorious within three to nine years.
Properties of Deep Seas
"Or (the unbelievers' state) is like the darkness of a fathomless sea which is covered by waves above which are waves above which are clouds, layers of darkness, one upon the other. If he puts out his hand, he can scarcely see it. Those God gives no light to, they have no light."
Water Masses Mixed But Distinguishable
"He has let loosed the two seas meeting together. Between them is a barrier which none of them can transgress. Then which of the Blessings of your Lord will you both (jinn and men) deny? Out of them both come out pearl and coral."
“And it is He Who has let free the two seas (kinds of water), one palatable and sweet, and the other salty and bitter, and He has set a barrier and a complete partition between them.”