Ilhabela is an archipelago and city situated in the Atlantic Ocean four miles (6 kilometres) off the coast of São Paulo state in Brazil. The largest island, although commonly called Ilhabela, is officially named Ilha de São Sebastião (St. Sebastian Island). During the holiday months, up to one hundred thousand people may be on the island, since it is a popular destination for tourists. To access the city, one must take a boat or ferry in São Sebastião, as there are no roads which reach it. During the summer, one may wait several hours to take the ferry boat. The ferry takes 15 minutes to cross the channel between the two cities.