Epic Yellowstone - Season 1 Episode 4 -

Yellowstone River is the longest undammed river in the contiguous 48 states, flowing with a wildness that is both violent and vital to the creatures that are drawn to its banks. From Yellowstone Lake, North America's largest high-elevation body of water, to the Missouri River, follow its nearly 700-mile journey over falls and through canyons into America's heartland. See how Yellowstone's bison, otters, coyotes, and thrill-seekers adapt to--and thrive in--these wild, untamed waters.