2 Fraser Island – Australia
The beaches of Fraser Island are dangerous whether you’re on land or underwater. In recent decades, the island has been overwhelmed with Irukandji, one of the world’s most poisonous jellyfish. Stung by these pretty small marine creatures, individuals may experience abdominal discomfort, vomiting, sweating, anxiousness, high blood pressure, respiratory failure, and, in extreme circumstances, fatal heart attack.
The island is also home to 25-30 pack of dingoes, an Australian kind of dog that has been known to attack people.