More than 14 million people in South Asia's low-lying delta regions could face displacement due to permanent inundation. Coastal cities like Mumbai and Kolkata are at risk of severe flooding from extreme rainfall, high tides, and storm surges. Land subsidence in areas like Chennai further exacerbates flood risks, as sinking land accelerates relative sea-level rise. These risks threaten infrastructure, livelihoods, and public health, making adaptation and mitigation efforts critical.