Chowpatty Beach, MumbaiTK Kurikawa/Shutterstock
Overwhelming pollution puts Chowpatty Beach in Mumbai on this list: Waste and debris cloud the waters and shoreline. To add insult to injury, a ship sank in the area in 2011 spilling 60,000 metric tons of coal. Not exactly the type of waters for beach fun. Similarly, find out the gross truth behind Hawaii’s white sand beaches.
Fraser Island, AustraliaSamPratt/Shutterstock
Famous for its eco-tourism, Fraser Island attracts adventure-seekers from all over the world. But the beach conditions are unpredictable, and attacks by the island’s dingo population have resulted in deaths. Visitors are instructed to avoid running down sand dunes and diving into lakes. Area officials also suggest folks avoid swimming on the eastern side of the island as conditions are extremely hazardous.
Amazon Beaches, South AmericaMariano Villafane/Shutterstock
You’ll find plenty of animals that pose an issue for swimmers here, such as anacondas, electric eels, piranhas, and vampire fish (candiru). Unfortunately, the area is also home to quite a bit of gang-related crime, like drug trafficking and robberies. Hundreds of small rivers make it easier for criminals to make their escape, like modern-day pirates.