The Mumbai Metropolitan Area/Mumbai Metropolitan Region (MMR) also known as the Greater Mumbai Urban Agglomeration is an agglomeration (or urbanised area) consisting of the metropolis of Mumbai and its satellite towns. Developing over a period of about 20 years, it consists of five municipal corporations and fifteen smaller municipal councils. The entire area is overseen by the Mumbai Metropolitan Development Authority (MMRDA), a Maharashtra state government organisation in charge of town planning, development, transport and housing. The MMRDA is has faced difficulties in developing proper integrated planning of the entire region. Although it is under Mumbai agglomeration the area outside of Brihan Mumbai lacks organised development. Also Navi Mumbai which is under MMR is the only place which is developing as a planned city and boast of largest planned city of the World, which was promoted by a Government formed company known as CIDCO (City and Industrial Development Corporation). The region is also famous for haphazard and illegal development as a result of rapid urbanisation. Many fear it is on the verge of becoming a Mega-slum . Villages along the National Highway NH3 (Old & New) in Bhiwandi Taluka are examples of haphazard developments in MMR, and these areas are famous for being the largest warehousing areas in India. Developers as well as Government agencies especially Town Planner and Collector of Thane have been reticent to address unorganised development.

The region has an area of 4,355 km² and a population of 17,702,761. [1]. It is linked to Mumbai through the Mumbai suburban railway.

Municipal Corporations

1. Brihan Mumbai (Mumbai),
2. Thane to the northeast of Mumbai
3. Kalyan-Dombivali
4. Mira - Bhayandar
5. Navi Mumbai to the east
6. Ulhasnagar
7. Bhiwandi - Nizampur

Municipal Councils

1. Alibag
2. Ambernath
3. Karjat
4. Khopoli
5. Kulgaon Badlapur
6. Matheran
7. Nala Sopara
8. Navghar-Manikpur
9. Panvel
10. Pen
11. Uran
12. Vasai
13. Virar

The area takes up four districts of Maharashtra state.

1. Mumbai City (complete)
2. Mumbai suburban (complete)
3. Thane (part)
4. Raigad (part)