white water 
noun [mass noun, often as modifier]
Fast shallow stretches of water in a river: white-water rafting...
- I'm told that the Orchy is also the most thrilling river in Britain for white-water rafting.
- The steep hills and valleys also offer superb rivers for white-water rafting.
- They can go white-water rafting and swimming, and Youth in Action days teach orienteering, map-reading, team-building and first aid.
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