As the world’s population climbs toward the 8.5 billion mark, there is the ever-present question of where some people are going to live. The answer for many, sadly, is this one: slums.
According to the United Nations, a slum is an area of a city mostly characterized by substandard housing and squalor. Right now, more than a billion of the human population lives in these places. But just which are the most populated?
Click through this gallery to discover the most heavily populated slums in the world.