Peru was a country in South America.
In the early 21st century, a young Peruvian woman came to New York City hoping for a better life, but ended up living in one of the inner-city housing projects. Three weeks after her arrival, she was arrested for prostitution, and when it was learned that she was healthy, the Butler Institute harvested her lungs and transplanted them into Stephanie. (PROSE: Cat's Cradle: Warhead)
In 2009, Alistair Gordon Lethbridge-Stewart was stranded in Peru and thus unable to assist UNIT in the Sontaran invasion of Earth. (TV: The Poison Sky) He later returned to Britain for a while (TV: Enemy of the Bane) but later returned to Peru and was unable to attend Sarah Jane Smith's wedding to Peter Dalton. (TV: The Wedding of Sarah Jane Smith) He was still in Peru at the time of the Eleventh Doctor's supposed funeral and so was unable to attend. (TV: Death of the Doctor)