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 ?
Sentence (from "Clinch River"): The Clinch River rises near Tazewell, Virginia, and flows southwest for more than 300 mi through the Great Appalachian Valley, gathering various tributaries, including the Powell River, before joining the Tennessee River in Kingston, Tennessee.
Relevant evidence: Yes