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Kosi Bay - Kwazulu-Natal, South Africa

Although South Africa is a must-visit place, this list has probably taught you that many of the beaches in this country are a no-go. And the Kosi Bay beach in Kwazulu-Natal is just another beach to add to that list. Although it's one of the most beautiful sights that this world has to offer, thanks to its interconnected lakes and sand dunes, this beach is pretty dangerous, mostly because of the bull sharks and malaria outbreak.

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If you want to avoid going home with a shark bite or contracting malaria, you're encouraged to stay out of the water and take your antimalarial drugs with you for your trip.