What is the longest unnavigable river in the United States?
What is the longest unnavigable river in the United States? The Susquehanna River is one of the oldest and most important rivers in North America. Flowing 448 miles, the Susquehanna travels through three states: New York, Pennsylvania, and Maryland. The 28,000 square mile watershed is the longest commercially unnavigable river system in North America.
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