* Valles Marineris: This canyon on Mars is 10 times longer, 20 times wider, and 7 times deeper than the Grand Canyon. It stretches for over 4,000 kilometers (2,500 miles) and is up to 200 kilometers (120 miles) wide and up to 7 kilometers (4.3 miles) deep.
* Grand Canyon: This canyon in Arizona, USA, is 446 kilometers (277 miles) long, 29 kilometers (18 miles) wide, and 1.6 kilometers (1 mile) deep.
Therefore, Valles Marineris is significantly larger than the Grand Canyon.
