PETER BOWATER / SCIENCE PHOTO LIBRARY PETER BOWATER / SCIENCE PHOTO LIBRARY
Alpine peaks. Trees in autumnal colour are seen on some of the mountainsides, although the higher ones are devoid of trees. The point at which the altitude becomes too great for tree growth is known as the tree line. Photographed on the Col de la Cayolle Road near Entraunes in the French Alps, looking towards Tete de l'Ecombrette.
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