Submitted by György Chityil ... on Fri, 01/19/2018 - 18:41 Hierarchy: Proper NounDescription: {{astronomy}} a large system of canyons on the surface of Mars; contains channels possibly caused by the flow of waterNgram: Valles MarinerisNgram Text: Valles MarinerisSource: WiktionaryIssue: 0Wiktionary tag: astronomyNgram Count: 2
