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Valles Marineris
[
val
-
uh
s-mar-
uh
-
nair
-is ]
SHOW IPA
/ ˈvæl əsˌmær əˈnɛər ɪs /
PHONETIC RESPELLING
noun
Astronomy
.
a canyon on Mars, 3100 miles (5000 km) in length, named after the Mariner spacecraft.