Rio Grande do Sul is a state in the southern region of Brazil. It is the fifth-most populous state and the ninth-largest by area. Located in the southernmost part of the country, Rio Grande do Sul is bordered clockwise by Santa Catarina to the north and northeast, the Atlantic Ocean to the east, the Uruguayan departments of Rocha, Treinta y Tres, Cerro Largo, Rivera, and Artigas to the south and southwest, and the Argentine provinces of Corrientes and Misiones to the west and northwest. The capital and largest city is Porto Alegre. The state has the highest life expectancy in Brazil, and the crime rate is relatively low compared to the Brazilian national average. Despite the high standard of living, unemployment is still high in the state, as of 2017. The state has 5.4% of the Brazilian population and is responsible for 6.6% of the Brazilian GDP.

The South Region of Brazil is one of the five regions of Brazil. It includes the states of Paraná, Rio Grande do Sul, and Santa Catarina, and covers 576,409.6 square kilometres (222,553.0 sq mi), being the smallest region of the country, occupying only about 6.76% of the territory of Brazil. Its whole area is smaller than that of the state of Minas Gerais, in Southeast Brazil, for example or the whole metropolitan France.