Hiking, Trekking, Backpacking, Mountaineering. 徒步, 山區健行, 背包旅行, 登山運動

Hikers enjoy a warm autumn day near the Lac Bleu near Arolla in the Val d'Herens, Switzerland on Octoner 12, 2017. (Photo by Denis Balibouse/Reuters)
People in the Landscape
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