Exploratour - Water on Mars
This image shows the landing site for the Mars Pathfinder mission.
Click on image for full size
Image from: NASA/JPL
Click on image for full size
Image from: NASA/JPL
Mars Pathfinder
That is why measurements from the Mars Pathfinder mission became important. Mars Pathfinder landed where there was once a flood. This let scientists study the land that may have had flowing water on it.
The two channels shown look very straight. This may mean that during the flood, the water came gushing directly out of the ground.