White water refers to the turbulent, frothy appearance of river water as it aerates while flowing rapidly over obstacles like rocks, ledges, or drops. This natural phenomenon creates "rapids," which are categorized by the International Scale of River Difficulty to help enthusiasts find appropriate challenges. The Scale of Difficulty

Moderate, irregular waves that may be difficult to avoid and require precise maneuvering.

Straightforward rapids with wide, clear channels and occasional maneuvering.

The evolution of white water navigation has moved from essential survival to a globally popular recreational sport: What Is Whitewater Rafting