...conclude his epic two-year journey in August…

...conclude his epic two-year journey in August at Pierre’s Hole, a shallow valley located in the drainage of the south fork of the Teton River in present Idaho.

John Colter, a member of the earlier Lewis & Clark Expedition and widely considered to be the first of the ‘mountain men,’ had asserted that he passed through the valley in 1808.

The south fork of the Teton River heads north through its mountain meadows, flanked by stands of timber, to rendezvous with the Snake River.

To mountain men, a low-lying valley surrounded by mountains is a "hole."

Mountain men work these areas as rivers and streams create good habitat for beaver and other fur-bearing animals.

This beaver rich basin is named in honor of "le grand Pierre" Tivanitagon, a Hudson's Bay Company trader said to be of Iroquois descent, who had been killed in a battle with members of the Blackfoot Confederacy in 1827.