It's heating up out there, which means you and the fam will likely be searching out ways to cool down over the next couple months. That probably means at least one trip to the chlorine rivers of your local water park, where you will undoubtedly be tempted to risk life and limb simply to plummet down a giant wet slide.

But all rides are not created equal, so if you really want to challenge your intestinal fortitude, search out the parks that hold these truly spectacular slides.

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Insano

Location: Beach Park, Fortaleza, Brazil

Everything you need to know about this water slide — or water cliff, we should say — is in its name. This is an insane water slide.

Standing a stomach-churning 41 meters (that's 14 stories) high, Brazil's Insano is officially the tallest water slide in the world. Unofficially, it's the one that gives us the most willies. After what looks more like stepping out of plane than scooching down a slide, riders plummet down the near-vertical ride for about four or five seconds, during which they'll reach the ungodly speed of about 65 mph. The ride then terminates with what the creators call a 'relaxing dive into the swimming pool.' Relaxing might not be the right word.

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Scorpion's Tail

Location: Noah's Ark Family Park, Wisconsin Dells, Wisconsin

It might not be as tall as Insano, but the ten-story high Scorpion's Tail at the popular Noah's Ark Water park in Wisconsin is equally gut-wrenching. Why? Because it's essentially one giant, water-slick loop. It's not quite vertical, though considering you'll be hurtling through it at about 50 feet per second, that's probably a good thing.

But Scorpion's Tail packs an even nastier surprise for those willing to brave its sting: a freefall drop to get you started. Rather than gently pushing themselves off, riders stand in a capsule for a few seconds until the ground abruptly gives way. Suddenly, that loop makes more sense, as it's the only thing slowing you down from the 2.5 gs of gravitational force driving you through the spray. Yikes.

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Summit Plummet

Location: Disney's Blizzard Beach at Walt Disney World Resort, Orlando, Florida

The family-friendly folks at Disney aren't necessarily known for pushing the envelope when it comes to thrill rides. The Summit Plummet at Disney's Blizzard Beach Water Park, however, is as extreme as water slides come.

It's 12 stories high -- good enough to be the tallest in the U.S. -- and features a 360-foot flume that carries riders to speeds between 50 and 60 mph. And did we mention much of that takes place in a darkened tunnel? Because what better to mix with your crippling fear of heights than your crippling fear of the dark? Is this really Mickey-approved?

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