The island where insurrectionists and violent criminals belong

Teeming with 4,000 venomous snakes... The Brazilian island where landing is prohibited
Ilha da Queimada Grande is located about 33km off the coast of São Paulo, Brazil. It is an uninhabited island, an island with no owner, but it is not an island that just anyone can land on. Warning signs are planted high, strictly prohibiting unauthorized(?) landings. What on earth is the reason?
It is because of the venomous snakes. Ilha da Queimada Grande is a paradise for venomous snakes. According to Brazilian authorities, there are an estimated 4,000 venomous snakes living on Ilha da Queimada Grande.