Bing found the following results
  1. Potomac River - Wikipedia

  2. Potomac, Maryland - Wikipedia

  3. Potomac River | Maryland, Virginia, Washington DC, & Map

  4. Potomac River - American Rivers

  5. Potomac River - WorldAtlas

  6. A Guide to the Potomac River - Washingtonian

  7. History & Culture - Potomac Heritage National Scenic Trail (U.S ...

  8. Potomac Heritage National Scenic Trail (U.S. National Park Service)

  9. 101 River Facts — Potomac Conservancy

  10. RiverExplorer - Potomac River Guide