LOCATION

Spacial Scale
Overpopulation is defined as a function of the number of individuals compared to the relevant resources, such as the water and essential nutrients they need to survive. It can result from an increase in births, a decline in mortality rates, an increase in immigration, or an unsustainable biome and depletion of resources. Overpopulation does affect the environment globally, but we will be focusing on its effects regionally. 

http://www.citymayors.com/development/dharavi.html

Geography
The Dharavi slum is located in western India just outside of the large city Mumbai and just south of the Mithi River. The slum is also located between the Central and Western Railways making its location and poor drainage systems the basis of pollution.