How Much Bigger Is Valles Marineris Than The Grand Canyon?
How Much Bigger Is Valles Marineris Than The Grand Canyon? Valles Marineris, or Mariner Valley, is a vast canyon system that runs along the Martian equator just east of the Tharsis region. Valles Marineris is 4000 km (2500 mi) long and reaches depths of up to 7 km (4 mi)! For comparison, the Grand Canyon