Question: Which 6.8 mi tributary empties into the Potomac River at the Marine Corps Base Quantico's Air Station near Triangle, Virginia?
Sentence (from "Chopawamsic Creek"): Chopawamsic Creek is formed by the confluence of the North and South Branches of Chopawamsic Creek and empties into the Potomac River south of Quantico at the Marine Corps Base Quantico's Air Station.
Relevant evidence: Yes