Oil rich Middle East countries are virtually a dry desert landscape.
Water for human consumption is obtained by purifying sea water in large quantities. Pumping stations are there to transfer this water to the consumers at considerable distances.
Why it cannot be practiced that the sea water should be pumped to create artificial salt lakes in the desert.
Over the period, natural filtering properties of soil can provide water fit for human consumption, marine life will be a bonus and to my thinking such arrangement will be more environment friendly.