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For anyone who studies Martian geology: What is the deal with the 5km deep gorge extending for 1000's of km around -70.654932°‎, -11.473828°‎?

It looks like the planet was almost torn in half.

(Turn on "MOLA Topography"-layer to see it)

The largest feature on Mars is so vast that it isn't normally visible: the Northern hemisphere is quite a bit lower than the Southern (1 to 3 km):

Edit: Very obvious in Google Maps Mars: