Can water be seperated??

The above two Photos are of the two rivers flowing in southern part near Cape Town , South Africa .

These two river flow together and finally settle down in the Ocean. The taste of one river water is extremely sweet whereas the taste of other river is extremely opposite (that is bitter) but they never mix. There is no physical barrier in between these rivers which stops them from mixing together but it is the will & order of God.

This came to know in the starting of 20th century only where as Almighty God has mentioned the nature of these two rivers in Holy Bible & Holy Quran 1400 years back .