Oswegatchie River.

The Oswegatchie River — usually associated with the Five Ponds Wilderness and Cranberry Lake Wild Forest to the west — has a small, 39-acre impoundment near Tupper Lake that registers as "Oswegatchie River" in state records but functions more like a pond than a moving waterway. It's a quiet, low-profile water in a region better known for Tupper Lake itself and the Raquette River drainage, and it doesn't show up on the usual touring or paddling circuits. No fish species data on file, no established trail access in the curated directory — likely private or minimally accessed shoreline. If you're working this corner of the park, you're either local or you've run out of obvious destinations.