How does Mars's Valles Marineris compare with Earth's Grand Canyon?

The answer

NASA calls Valles Marineris the solar system's largest canyon: about 3,870 km long and up to 9.3 km deep, more than 10 times longer and wider than Earth's Grand Canyon. California to New York, carved in rust.

Correct answer: It dwarfs the Grand Canyon: thousands of kilometers long and up to ~9 km deep