This article is about the demographic features of the population of Sri Lanka, including population density, ethnicity, education level, health of the populace, economic status, religious affiliations and other aspects of the population. Sri Lanka is an island in the Indian Ocean, also called Ceylon and many other names. It is about the size of Ireland. It is about 28 kilometres (18 mi.) off the south-eastern coast of India with a population of about 20 million. Density is highest in the south west where Colombo, the country's main port and industrial center, is located. The net population growth is about 0.7%. Sri Lanka is ethnically, linguistically, and religiously diverse.