benmost

At length, toward nine o'clock, just before the gray darkness of evening fell, a long, triumphant shout told that the glacier, so deeply and desperately hidden, was at last hunted back to its benmost bore.

Travels in Alaska John Muir 1876

As if rubus and the grass leaf were not enough of God's tender prattle words of love, which we so much need in these mighty temples of power, yonder in the "benmost bore" are two blessed adiantums.

Steep Trails John Muir 1876