297. Where does the groundwater come from?

This verse (23:18) talks of underground water.

Similar to water resources found above the earth, huge underground reservoirs are also found.

It was previously believed the sea water has seeped through sand to form the huge water reservoirs underground, only to be found later, to be untrue. 

When it is argued, the underground water accumulation is the result of sea water seepage, then the level of the accumulation should never go down, because the water level in the sea above remains undiminished.

It was discovered in 1580, the rain water falling on earth is being absorbed and retained underground. This being the reason the under ground water close to the sea being not salty. 

.The Quran has disclosed several centuries ago this fact as follows:-” “We brought down the water on earth as required, and let it be saved by it”. 

The indirect message conveyed by this verse is to develop towns and villages around the places where the water has been absorbed and retained underground.

This was revealed by the Quran nearly a thousand years ago before man could discover this fact, proving the Quran as the word of God yet again..