This thread is inspired by The Amazing Race (TV show), where I saw an activity called sledging in new Zealand. It's essentially a going down white water rapids with with a little board and flippers. It's also called riverboarding and hydrospeeding.
In Croatia, I did canyoning (also called canyoneering), where you go through a river canyon in whatever way needed - hiking, swimming, cliff jumping, and rappelling.
Researching riverboarding, I stumbled upon bellyaking, which is basically lying down in a smallish kayak and using hand flippers.
Anyone do any interesting sports around the world, specifically water ones? Looking specifically for ones that people would likely never have heard of