timberline

Etymology

timber + line

noun

  1. The height or limit beyond which trees do not grow in mountainous or Arctic regions.
    Most flocks in the Sierra and the Rocky Mountains live above the timber-line and at an altitude of twelve thousand feet. April 1915, Enos A. Mills, “Wild Mountain Sheep”, in The Rocky Mountain Wonderland, Houghton Mifflin, →LCCN, →OCLC, page 37

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