Mountain ridges or river beds?
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by thepaulius
I've spotted what looks like a volcano in bottom left, that's interesting! But also what are the large network or lines? Ridges or valleys?
Posted
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by mschwamb scientist, translator in response to thepaulius's comment.
Nicely spotted. Those are channels. They are carved into the surface of Mars by carbon dioxide gas trapped under the thawing carbon dioxide ice sheet on the south pole of Mars. You can learn more about what these features are here and here.
Cheers,
~MegPosted