Hydrological Map of North America Volcano That’s the spirit that underlies

That’s the spirit that underlies our map of Grand Teton National Park

this reproduction print of the Flatfish

New Mexico

It enhances the aesthetic quality of our watercourses

our National Park Series honors the spirit of some of North America’s most special places

Hydrological Map of North America Volcano That’s the spirit that underliesOur incredibly detailed map of North America shows the inherent beauty of the continent's system of waterways and lakes. The width of the rivers and streams on the map are determined by their Strahler number which defines their size based on the hierarchy of tributaries. Therefore, the thickness of the lines on the map do not represent the actual size of the waterway. The lakes on the map are representative of their actual shape and size in reference