Definition
A geographical area of the country identified on the basis of socio-economic and ecological criteria for DHS87. The country was divided into nine zones for the survey.
1. Colombo Metro consisting some urban areas in Colombo and Gampaha Districts.
2. Colombo feeder areas
3. South western coastal low lands
4. Lower South Central hill country excluding districts with a concentration of estates
5. south Central hill country with a concentration of estates
6. Irrigated Dry Zone with major or minor irrigation schemes
7. Rain fed Dry Zone