Delaware River
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The Delaware River's headwaters are in New York state and northern Pennsylvania. It is a popular area for watching bald eagles in wintertime.
At 282 miles long, the Delaware River is the longest free-flowing (undammed) river in the eastern United States. It is a state dividing line, with Pennsylvania's east side (and a bit of Delaware) on its western shore. On its eastern shore is a bit of southwest New York, and then all of New Jersey's west side.