On maps, rivers are typically depicted as blue lines — with a starting point, usually near a mountain where rainwater collects; and an endpoint, usually in a lake or ocean. With the advent of satellite imagery, tracing the path of a river is typically a simple exercise; no more hacking through brush and scaling mountains to map geography.
Yet peculiarly, there are still rivers in the world, in 2023, that have unknown destinations. One such river is in Pennsylvania's Lehigh Valley. Lest you think this river is in the middle of nowhere, know that the Lehigh Valley is a mere 115 miles west of the New York City metro area, one of the most populous regions in the country.
