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The articles seem to be about exactly the same thing. Rekov ( talk) 14:30, 13 September 2009 (UTC) reply

I was just coming here to propose the same thing myself! There is some distinction - K. vallis is part of K. valles - but certainly no need for two articles. I'll tag for merger and do it in a bit. DanHobley ( talk) 22:04, 6 August 2011 (UTC) reply

Kasei Valles and Mars Vallis, Mars Valles. Kasei Vallis is not official name International Astronomical Union - John Belushi ( talk) 10:15, 14 February 2012 (UTC) reply

I've gone ahead and transferred all pertinent info out of K. Vallis, and have made that page a redirect here. DanHobley ( talk) 04:50, 31 July 2013 (UTC) reply