timber line
timberline
tree line

Far down the mountain, emerging from the timber line he saw a group of riders.

Just don't go wandering down the Ice Cold into the bush below the timber line.

Soon we were below the timber line, small sticks at first, but the scrub becoming gradually taller and thicker.

But there were trees on all the lower slopes, and there was not really a timber line.

But these were in the high peaklands of the mountain country, far above the timber line; and such places were not suitable for men.

We slept the night at the timber line.

The timber line is at a height of about 11,000 feet, and is singularly well defined.

Below him, in various directions, he could see the timber line and toward this he hastened to make his way.

It is usually found at altitudes ranging from the coast to the timber line.

A small timber line, approximately 7 km long, also ran south from the town.