India is a largest South Asian country with diverse terrain and has a wide range of ethnic and cultural diversity.
Nepal is a landlocked South Asian country. It is located mainly in the Himalayas but also includes parts of the Indo-Gangetic Plain.
It is believed that Bhutan was inhabited as early as 2000 B.C. due to the presence of early stone implements discovered in the region.
Sri Lanka is an island country in South Asia, located in the Indian Ocean to the southwest of the Bay of Bengal and to the southeast of the Arabian Sea.