timber line

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Noun1.timber line - line marking the upper limit of tree growth in mountains or northern latitudestimber line - line marking the upper limit of tree growth in mountains or northern latitudes
line - a spatial location defined by a real or imaginary unidimensional extent
References in classic literature ?
It was a hard day's run, up the Canon, through Sheep Camp, past the Scales and the timber line, across glaciers and snowdrifts hundreds of feet deep, and over the great Chilcoot Divide, which stands between the salt water and the fresh and guards forbiddingly the sad and lonely North.
Two miles beyond Crater Lake lay Happy Camp--so named because here was found the uppermost fringe of the timber line, where men might warm themselves by fire again.
Tenders are invited for loading device with the mechanism of the piece of wood on the issuance of timber line Mebor
Those spaces--unornamented and naturally lit through rows of windows--are long, almost corridorlike, and each work corresponds in format: 46 Roaring Forties, 1988, takes the form of two abutting rows of twenty-three one-meter-square steel plates; 35 Timber Line, 1968, a straight line of meter-long timbers placed end to end; and Zinc Ribbon, 1969, a coil that unspools across the floor in a meandering strip of variable length, here approximately thirty feet.
The investment covers a new paint shop and increased processing capacity at the Kvarnasen facility, and a new timber line at the Nyby sawmill.
And none of them can subsist above about 2,700 feet of elevation (the timber line in the Lower 48, by contrast, is about 11,000 feet).
Even in the mountains of Tierra del Fuego there are distinct zones of vegetation, although they are highly compressed, as a result of their high latitude, and the timber line is situated at an altitude of only 1,968 ft (600 m).
And it mixes the fir fragrance of mountain timber line with the emerging scent of tender grasses on the sides of gentle hills.

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