Question: What is a tributary of the river near Tazewell, Virginia, and flows southwest for more than 300 mi through the Great Appalachian Valley, that drains a watershed area of 86.5 mi2 between Copper Ridge and Black Oak Ridge ?
{'answer': 'Beaver Creek', 'supporting_facts': [['Beaver Creek (Tennessee)', 0], ['Beaver Creek (Tennessee)', 1], ['Clinch River', 0]]}