Extreme weather events and disasters have been on the rise in the region.
India's development plans, requiring 11 million hectares of land over the next 15 years, is likely to stoke tensions
"The largest displacements in the context of disasters in 2021 occurred in China (6.0 million), the Philippines (5.7 million) and India (4.9 million). Most disaster displacements during the year were temporary," it said.
The displacements were a result of a combination of increasing hazard intensity, high population exposure and high levels of social and economic vulnerability, a report says.