Great Minquas Path was a trade route starting from a river which is how long?
Great Minquas Path: Great Minquas Path (or The Great Trail) was a 17th-century trade route that ran through southeastern Pennsylvania from the Susquehanna River, near Conestoga, to the Schuylkill River, opposite Philadelphia. 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.
464 mi long