That’s Valles Marineris.
Much evidence exists, that points to it having been created by ‘electrical machining.’ Scientists and researchers have created identical features in the lab, using that method.
A large body coming close to Mars, would have likely caused both planets to trade massive electrical discharges, causing major scaring, such as what we see today.
Thank you for the correction. It’s fascinating that massive electrical discharges could have caused the scaring.