South Asia is likely the most populated geographical area in the world.
The nine countries in South Asia account for one quarter of the world’s population: 1.9 billion people, including Bangladesh, which ranks 6th in population density; Pakistan, which boasts a population of 200 million; and India, which is the second most populated country in the world. But due to its large population and overcrowded cities, South Asia is also one of the poorest areas in the world, second only to Sub-Saharan Africa.
Whereas other areas are more religiously homogeneous, South Asian countries have very different religions, including Buddhism in Bhutan and Nepal, and Islam in Iran, Afghanistan, and Pakistan. Not to mention the fact that India mainly follows Hinduism, yet has the second largest Muslim population in the world. With the differences in religions combined with sovereignty controversies, the legacy of British colonization, South Asia has a long way to go to reach peace and harmony between nations.
(Iran and Afghanistan are categorized under South Asia as the United Nations M49 Standards, but traditionally, the two countries are listed as part of West Asia.)