Rocinha is a large favela located in Rio de Janeiro, Brazil with an estimated population of 180,000 people. It was originally settled in the 1920s by former slaves and workers from nearby coffee and sugar cane plantations. While many residents now have access to amenities like running water and electricity, challenges remain such as overcrowding, uncontrolled sewage flow that causes health issues, and the risk of diseases spreading rapidly due to the dense population. During major events like the World Cup, Rocinha sees tourism and economic benefits but underlying issues persist.