Challenges of urbanization: 5 biggest slums in the world 5 Photos . Updated: 19 Oct 2016, 02:56 PM IST Livemint Unchecked population growth and migration in many ... moreUnchecked population growth and migration in many world citiesfrom Kenya to Indiaresulted in one quarter of the city dwellers suffering from lack of housing, to basic needs like sanitation, to employment in the slums. In images 1/5Neza-Chalco-Itza, Mexico: Home to about four million people, it is the world’s largest slum. Despite its severe problems from continuing poor access to transport and schools to high crime rates, Neza is now teeming with micro entrepreneurs working from home or sharing spaces. Reuters 2/5Orangi Town, Pakistan: Asia’s largest slum in the port city of Karachi is home to around 2.4 million people. Known locally as “katchi abadis”, the first informal settlements emerged in the wake of the India-Pakistan war of 1947. Unlike many other slums worldwide the lack of services— not housing —is the major problem. Reuters 3/5Dharavi, India: After Orangi, the largest slum in Asia is Dharavi in Mumbai. Housing an estimated one million people, Dharavi generates an annual turnover of about $1 billion. The setting for Danny Boyle’s hit ‘Slumdog Millionaire’ (2008), also now houses the world’s first slum museum, Design Museum Dharavi. Hindustan Times 4/5Kibera, Kenya: Africa’s largest slum is home to anywhere between 400,000 and one million people. Much of Kibera’s employment comes from the nearby industrial area of Nairobi but an estimated half of its residents are jobless, surviving on less than $1 a day. AFP 5/5Khayelitsha, South Africa: The township, which was developed during the collapse of apartheid system in South Africa, has an estimated population of 400,000, with a striking 40% of its residents under 19 years old. Not enough affordable housing and absence of basic service like toilets remain the major problem.