(place) River flowing from E Wyo. east through N Nebr. into the Missouri: 431 mi (694 km)
Niobrara Sentence Examples
In the foothills there are typical canyons, as along the Platte forks, and in the northern edge of the sand-hills Those of the upper Republican are the largest, those of the Bad Lands are the most peculiar; and the Niobrara tributary system is the most developed.
The upper course of the Niobrara above the Keya Paha is in a narrow gorge.