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8. New Smyrna Beach
In Volusia County, Florida, you could find yourself headed for a vacation at a place called New Smyrna Beach. And on the surface, it looks like a great beach. Many people do go there, but...they tend to stay away from the waters, as there are a lot of sharks in the ocean around there.

7. Mumbai, India
India is the second most populated country in the world, so it shouldn't come as too much of a surprise that they have a lot of places to swim, from pools to rivers, lakes to oceans. However, when it comes to the beaches next to Mumbai, you're better off going someplace else. In fact, these beaches are so bad that they're consistently put on lists of the "most polluted beaches in the world". Yeah, I would never go swimming somewhere with that nickname.

6. Black Silty Hole Of Death
You can find the Black Silty Hole Of Death in the Gulf of Thailand, but no one would ever go anywhere near there. Of course, it's got a less intimidating name, the Samaesan Hole. It's the deepest diving site you can find near the nation of Thailand, so naturally, a lot of people go there to dive. Those people are taking their lives in their hands! To be fair, it's a worthy dive, it'll take you 280 feet (85m) below sea level, but it's in that depth that a lot of those divers have problems.

5. Bubbly Creek
If you were ever to go look at the rivers of Chicago, you would eventually find a place called Bubbly Creek. This "creek" is not a river per se, but it is in fact the South Fork of the South Branch of the Chicago River, and it's got quite a history. You see, this part of the river used to flow into Lake Michigan. But then, in the 20th century, the people of Chicago actually got the water to go in reverse. Why? Because Bubbly Creek was polluted, and Lake Michigan was the main water resource for the city, and they didn't want that polluted.

4. Eagle's Nest Sinkhole
Found in St. Petersburg, Florida, the Eagle's Nest Sinkhole is known as the "Mt. Everest of diving", and for good reason. It may not look like much on the surface, but as you dive down into this body of water, you'll soon find a cave system that is full of passages over 1 mile (1.6km) long. These passages lead to all sorts of interesting openings, including a cavern as big as a football field. Add to all of that, this sinkhole reaches over 300 feet (90m) below sea level.

3. Yenisei River
The Yenisei River is in Russia, and it is the true divider between East and West Siberia. It's also one of the worlds' largest rivers by discharge. The river is so large it passes through many major cities in Russia.
One major problem though, the river is also radioactive.
To be clear, this wasn't an "accidental" leak of radioactive materials in the river. It was quite intentional. This happened via Bolshoi Balchug, a plutonium factory that would get plutonium to make bombs. And they've been putting the discharge from this process into the river for decades, making it fullon radioactive as a result.

2. South Pacific Islands
This one might seem a bit vague, but there are a lot of examples of these dangerous waters where vicious animals attacked and ate unsuspecting humans!
You see, a lot of people dream of going on vacations to certain islands in the South Pacific and swimming in the clear blue waters that surround them. But what people sometimes fail to take into account is the animals that oftentimes reside in those waters.

1. Abyssal Zone
When you think about the ocean, you might think about how it encompasses our world in many forms. You might also dream of diving down to its very depths to see what's down there for yourself. One problem, if you do that "dream"...you're going to die, in various ways in fact.
First and foremost, yes, it is possible to go pretty deep into the ocean on a single breath. In fact, the world record holder for freediving (or diving without a scuba apparatus) is 700 feet (215m) below sea level, and it was done by Herbert Nitsch. While this is a praise worthy feat, even Mr. Nitsch would admit that there were plenty of risks in him attempting such a thing, especially without equipment.