Cruise ships to Rio Grande (Brazil) dock at Porto Alegre - largest city and the capital of the Rio Grande do Sul state. Its population of around 1,5 million (metro 4,3 million) ranks it as Brazil's 10th most populous. It is also the capital of country's 4th largest metro area - following Sao Paulo (21,2 million), Rio de Janeiro (12,3 million), Belo Horizonte (5,9 million, Minas Gerais state), and Distrito Federal e Entorno (4,3 million, Minas Gerais state).
Porto Alegre is located on Guaíba River's eastern bank, where 5 rivers converge, forming the "Lagoon of the Ducks". The lagoon is Brazil's largest (total area around 10,000 km2 / 3900 ml2), has length of 280 km (174 ml), max width of 70 km (44 ml) and is navigable by the largest ships.