Question: where does the delaware river start and end

title: Delaware River
text: The Delaware River rises in two main branches that descend from the western flank of the Catskill Mountains in New York . The West Branch begins near Mount Jefferson in the Town of Jefferson in Schoharie County . The river 's East Branch begins at Grand Gorge near Roxbury in Delaware County . These two branches flow west and merge near Hancock in Delaware County , and the combined waters flow as the Delaware River south . Through its course , the Delaware River forms the boundaries between Pennsylvania and New York , the entire boundary between New Jersey and Pennsylvania , and most of the boundary between Delaware and New Jersey . The river meets tide - water at the junction of Morrisville , Pennsylvania , and Trenton , New Jersey , at the Falls of the Delaware . The river 's navigable , tidal section served as a conduit for shipping and transportation that aided the development of the industrial cities of Trenton , Camden , and Philadelphia . The mean freshwater discharge of the Delaware River into the estuary of Delaware Bay is 11,550 cubic feet per second ( 327 m / s ) . 

Answer: answer: The West Branch of the river  begins near Mount Jefferson in the Town of Jefferson in Schoharie County , and the East Branch begins at Grand Gorge near Roxbury in Delaware County . They merge near Hancock in Delaware County and flow as the Delaware River until it discharges into the estuary of Delaware Bay.