Record floods and landslides devastate Southeast Asia as death toll surpasses 600

Southeast Asia is facing one of its most severe flood–landslide seasons in recent years, with more than 600 fatalities confirmed across Sri Lanka, Indonesia, Thailand and Malaysia.

In particular, Sri Lanka is facing one of its worst natural disasters in years as the death toll from floods and landslides triggered by Cyclone Ditwah has climbed to 334, with nearly 400 people still missing. Although rainfall eased after a week of intense downpours, large areas of Colombo remain submerged, particularly along the swollen Kelani River. More than a million residents have been affected, with entire communities displaced and extensive structural damage recorded in flood-prone regions such as Manampitiya. Authorities report severe shortages in essential services, including blood supplies, while saturated slopes continue to pose a high risk of additional landslides. Over 25,000 homes have been destroyed, prompting a nationwide emergency response and international assistance.

Heavy rainfall driven by a rare tropical storm system forming in the Malacca Strait produced prolonged, high-intensity precipitation that overwhelmed drainage networks and destabilised slopes across multiple regions. Indonesia has recorded at least 442 deaths, with North Sumatra, West Sumatra and Aceh experiencing widespread slope failures and extensive inundation. Two cities, Central Tapanuli and Sibolga, remain cut off due to washed-out roads and collapsed embankments, hampering access for relief teams.

The flooding has affected more than four million people regionwide, including nearly three million in southern Thailand and more than one million in western Indonesia. Transport corridors have been severely impacted, with road embankment failures, eroded culverts and collapsed retaining structures disrupting mobility and emergency access. Landslide-prone slopes, already saturated from successive rainfall events, experienced deep-seated failures that destroyed homes, blocked arterial routes and isolated entire districts. In Malaysia, localized slope collapses and rapid-rise flooding produced additional structural losses, though fatalities remained lower. 

Rescue teams in Indonesia are navigating damaged terrain with limited heavy equipment, slowing efforts to reach isolated communities. Warships carrying emergency supplies have been deployed to inaccessible coastal areas. Communication lines remain disrupted in multiple districts, complicating damage assessment and stabilization work. With slopes still saturated and rainfall persisting in several regions, authorities warn that additional failures remain likely. Long-term recovery will require extensive reconstruction of damaged transport links, reassessment of slope stability in critical zones and strengthened early-warning systems to address increasingly severe seasonal rainfall patterns.

Following, a video footage on the devastating South-East Asia floods.