I have a few high resolution watershed or drainage basin maps for sale via RedBubble. Low resolution previews of those available here:
Hudson River: raw landscape, modified landscape, full map
Delaware River: raw landscape, modified landscape, full map
Chesapeake Bay: raw landscape, modified landscape, full map
Potomac River: raw landscape, modified landscape, full map
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Patuxent: full map
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Delmarva: full map
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Shenandoah: full map
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Rappahannock: full map
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York: full map
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James: full map
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Albemarle/Roanoke: full map
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Pamlico/Neuse: full map
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