One of the most interesting thing about the Himalayas is how the Rivers interact with the Range and how the River Basins work. Since none of us is taught this in school in the Geography class the way one can study this fascinating aspect is to study Maps. Not the Maps of the new but the old Maps made by the Geological Surveys and the Royal Geographic Society Maps. The kind of detailing in these Maps is amazing when we keep in mind the fact that it was all done by boots on the Ground. No Aerial or Satellite Cartography.