From Wiktionary, the free dictionary
From Latin vallēs (“valleys”) + pseudo-Latin genitive of English mariner.
- IPA(key): /ˈvælɪs ˌmɛəɹɪˈnɛɹɪs/
Valles Marineris
- a large system of canyons on the surface of Mars; contains channels possibly caused by the flow of water
