Timber-Line
TIMBER-LINE, in physical geography, the line of elevation above sea-level above which trees do not grow. In any hilly locality, which is not of too high latitude to allow of trees growing near the sea-level, this line is generally clearly marked. It varies not only with general but also with local conditions of climate, just as does the snow-line.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)