Cartographers like Dan Coe battle the notion that everything on the planet has already been mapped. "The world is always ...

The top left portion of the map shows much of the Pacific Northwest basin, illustrated in a brownish-orange color. And, the Upper and Lower Colorado River basins stand out as well, in bright yellow.

America's rivers act as veins of life, threading across the nation to nurture countless plant and animal species with their precious water and bringing beauty and quiet-recreation opportunities to ...