O primitivo Fortim de São Tiago na barra da Bertioga foi reconstruído, ao final do século XVII, em alvenaria de pedra e cal, tendo as suas obras definitivas sido concluídas em 1710, quando se encontrava artilhado com onze peças. O desenho da sua planta apresentava o formato de um polígono retangular com guaritas nos vértices.

Forte de Bertioga - Bertioga visitor guide showing a virtual tour of 'Forte de Bertioga' linked to an interactive map with local and travel information. 360° panoramas from São Paulo.

The current version of the Forti de São Tiago (St James Fort) in Bertioga is not the original fort on the site. It dates from the 18th century, having been rebuilt out of stone and lime and completed in 1710. At the time, the rectangular fort, which has watchtowers at the corners, contained 11 cannon defending the entrance to Bertioga Canal and the Rio Itapanhau. Today, in quieter times, it offers a good viewpoint over the beach below and out to sea and is one of the tourist attractions in Bertioga, a town famous for the Festa Nacional do Índio (Brazil's National Indian Festival) which takes place in April.

Road: Bertioga lies on the SP-055 (BR101) road, about 40km east of Santos and Guarujá. It is about 120km from São Paulo.