Montana River, probably the <a href="//commons.wikimedia.org/w/index.php?title=Yellowstone_River&amp;action=edit&amp;redlink=1" class="new" title="Yellowstone River (page does not exist)">Yellowstone River</a> or <a href="https://en.wikipedia.org/wiki/Big_Hole_River" class="extiw" title="en:Big Hole River">Big Hole River</a>.
<a href="//commons.wikimedia.org/wiki/User:Bobjgalindo" title="User:Bobjgalindo">Bobjgalindo</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>