Assertion: canyon's wall | /r/HasProperty | listed by the guinness book of records
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text: The Vikos Gorge, with a length of 20 km (12 mi), walls that range from 120–490 m (390–1,600 ft) deep, and a width ranging from 400 m (1,312 ft) to just a few meters at its narrowest part, is listed by the Guinness Book of Records as the deepest canyon in the world in proportion to its width, though some gorge lobbyists contest that claim.