Where did people experience a lot of sanitation over crowded conditions and widespread poverty?

People often experience overcrowded conditions and widespread poverty in urban slums and informal settlements in developing countries. Cities like Mumbai, Dhaka, and Nairobi are notable examples, where rapid urbanization has led to inadequate housing and sanitation facilities. These areas typically struggle with limited access to clean water, proper waste disposal, and health services, exacerbating public health issues. The combination of high population density and poverty creates challenging living conditions for residents.