As we know, and according to the NASA, there must have been water on the planet in a distant past.
But a new study made by scientist Dr. Tjalling de Haas of the Utrecht University in the Netherlands, there must have been liquid water in less than 200,000 years.
ANCIENT CIVILIZATION ON MARS
According to Frank van Ash who has analyzed the image, it is quite possible that that the darker lower parts of the region has been filled with water.
Then you got a lake with three rivers, two rivers that bring water into the lake and one river that let the water flow out.
One river comes in a lot higher than the lake itself, so, either you have a very huge waterfall or you can find a solution by building some kind of dam to control the water flow and maybe that’s exactly what an ancient civilization did.