Some beaches, while beautiful, have hidden perils, reasons someone sunbathing shouldn't cool off with a dip. To help you out, we’ve compiled a list of beaches where you’ll definitely don't want to go swimming.

Chowpatty Beach, Mumbai, India

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You might be able to figure this one out for yourself when you’re close up, but despite the many beaches within the city, none are safe for bathing. While Chowpatty Beach is Mumbai’s most popular beach and is the host of the city’s annual celebration in honor of the Hindu god Ganesh, it is littered with waste and debris. Large amounts of untreated sewage reach the coastline and, with steadily increasing pollution levels, any beachgoer is at serious risk of infection.

New Smyrna Beach, Florida, U.S.A.

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The warm climate and incredible surf at New Smyrna Beach in Florida tempt its visitors to jump in the water. But it's what’s lurking underneath that’s the trouble. Due to the volume of attacks, the beach has gained the title of "shark capital of the world." The sharks are attracted by large populations of fish as well as the floating surfboards overhead; it’s the ideal snacking ground. While none of the attacks on humans have been fatal, and diehard surfers continue to jump in, we wouldn’t recommend it.

Hanakapiai Beach, Kauai, Hawaii

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The islands of Hawaii are renowned for their glorious beaches, and as idyllic settings go, you can’t get much more perfect than Hanakapiai Beach. A well-known checkpoint in Hawaii, visitors trek a rocky, 3.2-kilometer hiking trail to get there. The temptation to jump in and cool off is overwhelming. However, as the area isn’t protected by any reef, its currents are vicious. Powerful rip currents are capable of pulling even the most experienced swimmers out to sea. With no lifeguards, no hope of rescue and a handmade sign with a death-tally on it as a stark reminder of the water’s power, you’d be mad to chance it.

Fraser Island, Queensland, Australia

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Fraser Island boasts one of the most awe-inspiring beaches in the world, stretching an incredible 120 kilometers along its east coast. While the crystal clear waters try to lure visitors in, there is more than one threat waiting. Underneath the water, nearly invisible box jellyfish are lurking, able to kill a full-grown adult with their sting. If the jellyfish don’t get you, then the many sharks in the bay will be next in line. On top of all that, the tides can be vicious. It seems the beaches on the Island aren’t meant for human paddlers.

Gansbaai Beach, Gansbaai, South Africa

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While Florida has gained the title for shark capital of the world, Gansbaai is home to the most great white sharks. The sharks are attracted to the area because of the huge colony of fur seals, which live in the water between Dyer Island and Geyser Rock. The channel, known as shark alley, is a stretch of water to be feared. If you like to get your adrenaline pumping, you can book a cage dive. You can get up close and personal with the world’s most notorious shark and live to tell the tale.

Playa Zipolite, Oaxaca, Mexico

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With a nickname "The Beach of the Dead," Playa Zipolite is no place for a casual swim. The beach is picturesque, and the dangers are certainly hidden to the naked eye. In fact, they are also hidden to all the naked people; the beach is popular with backpackers and nudists. The danger comes from the giant waves that create extremely dangerous undercurrents. Swimmers are easily pulled out into the water. The introduction of a specialized lifeguard crew has reduced the number of drownings, but you’re safer sunbathing on the sand.

The Black Sand Beaches, Kilauea, Hawaii

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The black sand beaches of Kilauea, located in Volcanoes National Park, are certainly beautiful. The sand is an incredible contrast to the golden sands we’re used to elsewhere, and the water looks eerily inviting. However, a beach located next to one of the world’s most active volcanoes, Mount Kilauea, needs to be approached with caution. The temperature of the water can reach up to about 110 degrees. You’ll want to be careful not to burn your toes. Don’t let that stop you visiting though, having erupted as recently as last year, there are new black sand beaches to explore, and the area needs tourism more than ever.