Not only Valles Marinaris, but also Ma'adim Vallis is significantly longer, wider, and deeper than Earth’s Grand Canyon at over 700 km long, 20 km wide, and 2 km deep. (📷 Viking) via /r/spaceporn https://ift.tt/2MlYEin
from Tumblr https://ift.tt/2VKsb8K
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