Copper Canyon Travel
First Class Train to Ciudad Chihuhua, Mexico - Page 6

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Then things begin to get interesting again.  When you consider that the Tarahumara live all through these canyons, it's hard not to wonder if there are any natives living in the mountains beside the train.  The best guess is that there are.  The Tarahumara are never seen unless they wish to be.  Nor do they like to live in communities.  A small group of 10-12 people could inhabit the mountain in the picture.