Dehiwala-Mount Lavinia, population 245,974 is the second largest Municipality in Sri Lanka, and covers an extent of 2109 hectares. It lies south of the Colombo Municipal Council area and separated from it by the Dehiwala canal which forms the northern boundary of DMMC. Its southern limits lie in Borupana Road and the eastern boundary is Weras Ganga with its canal system and including some areas to its east. This town has extensive population and rapid industrialization and urbanization in recent years. It is home to Sri Lanka's National Zoological Gardens, which remains one of Asia's largest.

Colombo South Teaching Hospital, Kalubowila and Colombo Airport, Ratmalana are some important landmark in this area. Dehiwela-Mount Lavinia and Sri Jayawardenapura Kotte being two large suburban centers of the city of Colombo function together as one large urban agglomeration in the Region. The overspill from the City in residential and commercial uses of land have rapidly urbanized these suburban centers. Dehiwela-Mount Lavinia and Sri Jayawardenpaura along with Colombo Municipal Council form the most urbanized part of the core area of the Colombo Metropolitan Region.

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