I have a few high resolution watershed or drainage basin maps for sale via RedBubble. Low resolution previews of those available here:
I'm planning on adding maps for the Chesapeake Bay, Susquehanna, Delaware, and Hudson rivers over the next year.
Potomac River: raw landscape, modified landscape, full map
Chesapeake Bay: raw landscape, modified landscape, full map (coming soon)
Patuxent: full map
Shenandoah: full map
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