The watersheds of the Tennessee & Cumberland rivers, rendered as an urban transit network. They’re conveniently shaped to fit on one landscape-oriented map together. Sometimes nature makes it easy.
Click the image below to view/download a free PDF, which you may use according to the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. If you wish, you can pay me what you think my work is worth, via PayPal.