São Cristóvão (Portuguese pronunciation: [sɐ̃w kɾisˈtɔvɐ̃w], Saint Christopher) is a Brazilian municipality in the Northeastern state of Sergipe. Founded at the mouth of the Vaza-Barris River on January 1, 1590, the municipality is the fourth oldest settlement in Brazil. São Cristóvão is noted for its historic city square, São Francisco Square, and numerous early colonial-period buildings. The 3 hectares (7.4 acres) site was designated a UNESCO World Heritage Site in 2010.