Examples from the Web for timberline
Old Timberline started down into a caon as though to descend a gully diagonally to the bottom.
Beech trees appear at all elevations between 3,000 feet and the timberline.Area Handbook for Albania|Eugene K. Keefe
Timberline; terrific glacial work; high perpendicular precipices.Rocky Mountain [Colorado] National Park|United States Dept. of the Interior
Already weak, they did not get down to timberline the first day.Watched by Wild Animals|Enos A. Mills
The territory dominated by old “Timberline” had an area of about eighty square miles.