Rio de Janeiro, or Rio, was a city and a state in Brazil.
In 2008, the Sixth Doctor and Charley visited the waters near Rio aboard a casino boat that was attacked by the Tabbalac. The passengers all evacuated to Rio. (AUDIO: The Raincloud Man)
Brian Williams visited Rio when travelled around the world. (TV: Dinosaurs on a Spaceship)
The Fifth Doctor and Turlough visited Rio de Janeiro in 2080. They encountered Ileana de Santos, who was a werewolf and had been since Napoléon Bonaparte's troops marched on the town in 1812. (AUDIO: Loups-Garoux)
Clyde Langer falsely believed Rio de Janeiro to be the capital city of Brazil. Infact, the capital of Brazil was Brasília. (AUDIO: The Thirteenth Stone)
During her travels with the Eleventh Doctor, Amy Pond wanted to see Rio de Janeiro in the year 2020. She dressed for the warm climate, but was disappointed to find herself almost six thousand miles off course when the TARDIS materialised in Cwmtaff, Wales, at the site of Nasreen Chaudhry's drilling operation. (TV: The Hungry Earth)
In their attempts to get to Rio, they encountered dragons, went jousting and visited Tibet. (PROSE: The Glamour Chase)
The Tenth Doctor compared Florence to Ronald Biggs hidding in Rio de Janeiro. (TV: Smith and Jones)