The Hudson River forms the boundary between the states of New York and what other?

Question

Which river flows from north to south through eastern New York State, USA, and briefly forms the border between Pennsylvania and New York before emptying into the Atlantic Ocean?

Answer 1

Hudson River. Hudson River, river in New York state, U.S. It flows almost entirely within the state, the exception being its final segment, where it forms the boundary between New York and New Jersey for 21 miles (34 km).