Meaning of Valles Marineris

Val'les Mar•i•ner'is

Pronunciation: (val'us-mar"u-nâr'is), [key]
— Astron. Astron.
  1. a canyon on Mars, 3100 mi. (5000 km) in length, named after the Mariner spacecraft.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.