In this task, you're given passages that contain mentions of places and we are supposed to find the answer to a given question. Craft one correct answer to the question given in input. Make sure your correct answer is consistent with the context, and properly gives the exact location where the query was performed.
 In your answer, use as few words as possible from the given context. To be less repetitive, please vary your language for each question.
Q: Sentence: The Yellowstone River rises on the continental divide near Younts Peak in Wyoming's Teton Wilderness. It flows north through Yellowstone National Park, enters Montana near Gardiner, and passes through the Paradise Valley to Livingston. It then flows northeasterly across the state through Billings, Miles City, Glendive, and Sidney. The Yellowstone joins the Missouri in North Dakota just east of Fort Union. It is the longest undammed, free-flowing river in the contiguous United States, and drains about a quarter of Montana (36,000 square miles (93,000 km2)). 
Question: Where does the Yellowstone meet the Missouri river?
A: 
North Dakota