Think You Know Mars Enough to Take the Ultimate Mars Challenge?Share:FacebookPinterestTwitterMailWhat is the name of the largest canyon system on Mars?67%Next Correct Incorrect Valles Marineris is a vast canyon system over 4,000 km long. What is the name of the largest canyon system on Mars? Mariner Trench Gale Crater Valles Marineris Coprates Chasm 67%
