Floods in Indonesia, Sri Lanka, Thailand and Vietnam Have Killed Over 1,200. Here’s What to Know.

Floods across Southern Asia, particularly in Indonesia and Sri Lanka, have killed at least 1,200 people as of December 1, 2025, with hundreds missing and millions displaced. Indonesia has reported over 600 deaths and hundreds missing, while Sri Lanka faces what its president calls the nation's worst natural disaster. Thailand and Vietnam have also experienced significant fatalities, with at least 160 and 90 deaths respectively. The unusually intense monsoon season is attributed to factors including La Niña and the effects of climate change, which intensifies tropical cyclones. Several cyclones, including Ditwah and Senyar, have contributed to the widespread devastation across the region.