The Southeast is a region of the state of Rio Grande do Sul, in the South of Brazil. Cities Arroio Grande Balneário Cassino Barra do Chuí Caçapava do Sul Canguçu Chuí Herval Jaguarão Pelotas Piratini Rio Grande - Oldest city in the state. São José do Norte São Lourenço do Sul Other destinations Understand Get in Get around See Dom Pedro II Citadel in Caçapava do Sul (Forte de Dom Pedro II de Caçapava), Rua Dom Pedro II, Caçapava do Sul, Rio Grande do Sul (A small 20-minute detour south of the BR-290/BR-392 junction if you're driving from Porto Alegre to Uruguaiana or from Santa Maria to Pelotas.), -30.508373°, -53.492440°. A large, hexagonal 19th century citadel with projecting pentagonal bastions that sits in the middle of the city. Constructed 1848–1856. Do Eat Drink Stay safe Go next