Ilha da Queimada Grande, more commonly referred to as Snake Island, is an island off the coast of Brazil in the Atlantic Ocean. The island became famous for its abundant snakes, hence the name Snake Island. It is administered as part of the municipality of Itanhaém in the State of São Paulo.

The island most famously "overrun" by snakes is Ilha da Queimada Grande, located about 33 kilometers off the coast of Brazil. Known as "Snake Island," it is the only home of the Golden Lancehead Pit Viper, one of the most venomous snakes in the world. Legend often claims there is "one snake for every square meter," and the Brazilian Navy has strictly prohibited public access to the island for decades to protect both the endangered snakes and human life. Another island frequently cited is Guam, though its situation is different. Guam has been ecologically devastated by the Brown Tree Snake, an invasive species introduced accidentally after World War II. While you won't see them carpet-covering the ground like on Snake Island, they have reached densities of up to 5,000 per square kilometer in the jungle. These snakes have caused the extinction of nearly all of Guam's native forest birds and frequently cause massive power outages by crawling into electrical transformers, making them a major environmental and economic burden in 2026.