Fortaleza_de_São_João_(Rio_de_Janeiro)
Fortress of São João (Rio de Janeiro)
16th-century star fort in Brazil
The Fortress of São João da Barra do Rio de Janeiro (Portuguese: Fortaleza de São João da Barra do Rio de Janeiro), commonly known as the Fortress of São João or São João Fort,[1] is a 16th-century star fort in the present-day Urca neighborhood of Rio de Janeiro, erected by Estácio de Sá to protect Guanabara Bay from French invasion.[2]