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blackwater rafting

British  

noun

  1. Also called: cave tubing.  the sport of riding through underground caves on a large rubber tube

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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It was the first place in the world where you could bungee jump, and jet boating and blackwater rafting in caves are among its other attractions.

From New York Times