Multimedia journalist Souvid Datta has captured some very poignant photos of the slums.
Souvid Datta
In an interview, Datta told BBC's Dan Damon why the slums became a subject of his work. You can watch it here:
These are the Panditya and Gorcha bastis on the Southern outskirts. They are home to over 400,000 people.
Souvid Datta