Question: Mahanoy Creek is a 51.6 mi tributary of the Susquehanna River, in Northumberland and Schuylkill counties, Pennsylvania, a major river located in the northeastern region of which country?
Sentence (from "Susquehanna River"): At 464 mi long, it is the longest river on the East Coast of the United States that drains into the Atlantic Ocean, via the Chesapeake Bay.
Relevant evidence: No