Snake Island, Brazil
You might be wondering why no-one is allowed on Snake Island in Brazil. Considering that the island is literally covered with deadly snakes (one snake per square foot), you might want to think about going elsewhere. Just to clarify, these are actually venomous snakes!
Snake Island Brazil
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North Sentinel Island, India
This location is somewhat different from the others on our list. This island is forbidden to enter, but for other reasons. The Sentinelese people have had no contact with the outside world. In some rare cases, a human has crossed the water to the inhabitants, but they did not make it back.
North Sentinel Island India
