To get to Barreirinhas, it is necessary to take a flight to São Luís, the capital of the state of Maranhão.
From there, you can take buses or hire a private transportation service that takes about 4 hours to get to Barreirinhas.
It is also possible to take a direct flight to Barreirinhas from São Luís, but it is a more expensive option. Once in Barreirinhas, you can hire tours to visit the tourist attractions in the area.
See more information about Barreirinhas
See also information on São Luís.