Most of the international migrants in 2017 were from India, followed by China and Bangladesh, an Asian Development Bank (ADB) report said.
The report further said as many as one-third of international migrants were from Asia in 2017.
"India had the most outward migrants in 2017 (17 million), followed by China (10 million) and Bangladesh (7.5 million)," said ADB's report titled 'Asian Economic Integration Report 2018'.
"About one in three international migrants are from Asia led by India and the PRC (People's Republic of China)," it added.
According to the report, Asia continued as the largest source of international migrants globally although the number of Asian migrants headed to regional destinations declined slightly.
"The global stock of international migrants from Asia rose 3.9 percent from 83.6 million in 2015 to 86.9 million in 2017," it said.
The report also said intraregional migrants to India largely come from neighbouring countries such as Bangladesh (3.1 million), Pakistan (1.1 million) and Nepal (0.5 million).
It said global FDI into the region (measured by gross inward FDI) remains stable at $517.5 billion in 2017 from $519.9 billion in 2016.
The report also said greenfield or new investments generated some 667,000 jobs in 2017â€”mainly in India, the PRC, Viet Nam, the Philippines, and Singaporeâ€”in real estate, software and information technology (IT) services, and electronic components, among others.
As per the report, Asia's outward foreign direct investment(FDI) moderated by 1.4 percent in 2017â€”to $487.9 billion from $494.9 billion in 2016. "Emerging Asian investors boosted outward FDI in 2017â€”with, for example, India doubling its outward investments in sectors such as electronic components and rubber," it said.
The United Nations (UN) recommendations on statistics of international migration define the 'stock of international migrants present in a country' as 'the set of persons who have ever changed their country of usual residence, that is to say, persons who have spent at least one year of their lives in a country other than the one in which they live at the time the data are gathered'.