In England there's a body of water called the Bolton Strid, while many people just refer to it as the strid. Many people argue it's one of the world's most dangerous bodies of water.
While it does look fast moving, how could such a narrow mountain stream be one of the world's most dangerous bodies of waters when we have raging rivers, waterfalls, giant oceans, etc?
The strid is so dangerous because it's deceiving just how dangerous it is. It looks non threatening and looks as if you could jump across it.
At one point the strid is actually a river, however when it hits the mountain stream area it narrows and deepens quickly causing it to pick up speed and power. There are many underground caverns and waterways that you can't see from above the water.
Many say it has a 100% fatality rate, though we have no way of knowing this for sure.
If you ever make it over to Yorkshire England it's definately something worth checking out