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Valles Marineris

American  
[val-uhs-mar-uh-nair-is] / ˈvæl əsˌmær əˈnɛər ɪs /

noun

Astronomy.
  1. a canyon on Mars, 3,100 miles (5,000 km) in length, named after the Mariner spacecraft.


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"We investigated two sulfate-bearing sites near the vast Valles Marineris canyon system that included mysterious spectral bands seen from orbital data, as well as layered sulfates and intriguing geology," said Bishop.

From Science Daily • Mar. 10, 2026

“What would a coffee mug or a car or any work of my design that was left in the canyon of the Valles Marineris on Mars for 15,000 years look like?”

From New York Times • Sep. 20, 2022

Perhaps places of great natural splendor or scientific interest, such as the Red Planet’s gigantic Valles Marineris canyon, would always remain off-limits.

From Scientific American • May 21, 2019

It would be expected to come out in specific locations: near a fault at the bottom of Valles Marineris, for instance.

From Science Magazine • Nov. 22, 2017

The Red Planet showing the Valles Marineris canyon system across the center.

From "Spooked!" by Gail Jarrow