[Magnum44]

I am not a geologist, so what do I know, but it seems to me like these large rivers come to stubby upstream ends with no real signs of smaller tributary rivers and streams flowing into them. It doesn’t seem consistent with being water carved.

I had heard theories years ago that the mars ‘canals’ were actually the result of the crust cooling, perhaps at such a rate that it left the surface ‘cracked’.

But honestly I have no idea.

[Raycpa]

Interesting observation. When I looked again it more closely resembles scar tissue from a cut on skin.

[Openurmind]

That is my theory, fault lines from some source, maybe larger impacts that displaced the crust and have been blown by winds after the fact.

But I am hoping for more proof of liquid. Read an article yesterday that they may have found a lake with evidence of solution and evaporation of salts from the soil. This would indeed require a liquid of some sort.

[rawcatslyentist]

http://www.holoscience.com/wp/mars-and-the-grand-canyon/

Here's an explanation that makes sense, but the scale blows our tiny minds.

[Openurmind]

I don't know, I might have to ditch my theory. This looks pretty much like the tributaries you mention. A larger image of this area I just took in Google Earth, it is a tourist trap with a hiking trail and all. lol