The extreme upper limit of the belt is reached between the middle and south forks of the Kaweah at a height of 8400 feet, but the finest block of big tree forests in the entire belt is on the north fork of Tule River, and is included in the Sequoia National Park.
In the northern groves there are comparatively few young trees or saplings.

But here for every old storm-beaten giant there are many in their prime and for each of these a crowd of hopeful young trees and saplings, growing vigorously on moraines, rocky edges, along water courses and meadows.

But though the area occupied by the big tree increases so greatly from north to south, here is no marked increase in the size of the trees.

The height of 275 feet or thereabouts and a diameter of about twenty feet, four feet from the ground is, perhaps, about the average size of what may be called full-grown trees, where they are favorably located.

The specimens twenty-five feet in diameter are not very rare and a few are nearly three hundred feet high.