Santo Domingo River, Chiapas, MexicoRio Santo Domingo is known as the steepest kayakable river in the world. Oregon Kayaking defines rafting there as the Holy Grail of big-drop steep creeking.See why in this video.
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Whirlpool Rapids Gorge—Niagara River, New YorkThe Niagara Gorge is a deadly section of exploratory rapids. As the water travels through, it reaches about 30 mph, creating the Class 6 Whirlpool Rapids, some of the most extreme in the entire world.