The world's most dangerous islands Eight deadly islands where you wouldn't want to be washed ashore. Ilha da Queimada, Brazil Ilha da Queimada, nicknamed Snake Island, lies off the coast of Brazil and is home to thousands of Golden Lancehead Vipers - and little else. The snakes are among the world's most venomous, and there is, according to local legend, around five of the slithering critters to every square metre. For years, the only human inhabitant was a lighthouse keeper, but now the Brazilian Navy has banned all civilians from the island.