Niobrara National Scenic River traverses several hundred miles of north-central Nebraska. This is one of the most rural parts of an already rural state, so there are not a lot of towns near the river. Niobrara National Scenic Rivers headwaters are located near the small town of Valentine. The river ends far to the east, where it joins with the much larger, Missouri River. This is near the town of Niobrara, near the South Dakota border. The nearest larger city is Sioux City, IA, located almost 100 miles to the east of Niobrara.