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Valles Marineris

[val-uh s-mar-uh-nair-is] /ˈvæl əsˌmær əˈnɛər ɪs/
noun, Astronomy
a canyon on Mars, 3100 miles (5000 km) in length, named after the Mariner spacecraft. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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