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A division in altitude (or latitude) above which trees tend not to grow on mountains.

Tree line above St. Moritz, Switzerland. May 2009

A division in altitude (or latitude) above which trees tend not to grow on mountains.

In this view of an alpine tree line, the distant line looks particularly sharp. The foreground shows the transition from trees to no trees. These trees are stunted in growth and one-sided because of cold and constant wind.

A division in altitude (or latitude) above which trees tend not to grow on mountains.

Alpine tree line of mountain pine and European spruce below the subalpine zone of Bistrishko Branishte, with the surmounting Golyam Rezen Peak, Vitosha Mountain, Sofia, Bulgaria