Snake Island is the deadliest place on Earth: 4,000 vipers, one per square metre, and zero tourists allowed

Ilha da Queimada Grande, or Snake Island, is a dangerous place. Thousands of golden lancehead snakes live there. Their venom is very potent. Brazil has banned public access to protect people and snakes. The island's snake population faces threats. These include poaching and habitat loss. Scientists study the snakes' venom for medical potential. Conservation efforts are crucial for their survival.

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