Rocinha is the largest favela in Rio de Janeiro, located between the districts of São Conrado and Gávea, with over 150,000 residents. It developed after World War II as Portuguese, French, and Italian farmers settled and grew vegetables for Rio's southern zone. While most homes now have electricity and are made of brick or cement, sanitation remains a challenge as sewage flows through open channels and housing is very compact. During the World Cup, local residents rented out their homes to visitors and the government promised to clean the favelas, though challenges remain.