The president called the nationwide flooding the largest and most challenging natural disaster in the island’s history, as emergency rescue efforts continue.

Extreme weekend weather across Sri Lanka and Southeast Asia has displaced millions. Elon Musk made Starlink available for free in some affected regions.

There are red alerts in the coastal regions of India. Sri Lanka has declared a national emergency, calling Cyclone Ditwah the largest disaster the country has ever faced. In some parts of Thailand, flooding has reached record levels.

Recovery and aid efforts are underway in parts of Southeast Asia and South Asia where the full number of dead and missing are not yet known after heavy rains and flooding left a devastating toll in the past week.

Sri Lanka and Indonesia deployed military personnel on Monday to help victims of devastating flooding that has killed nearly 1,000 people across four countries in Asia in recent days.

Over the past week, torrential rains and cyclone-driven winds have led to catastrophic flooding across Indonesia, Malaysia, Thailand, and Sri Lanka. The disaster has claimed more than 420 lives across the region, including 123 lives lost in Sri Lanka, with tens of thousands displaced and critical infrastructure severely damaged.

Hundreds more are missing following flooding and landslides in the past week, which killed at least 502 people in Indonesia, 334 in Sri Lanka and 170 in Thailand, authorities said.

Indonesia sent three warships carrying aid while Sri Lanka used military helicopters to reach people stranded by flooding.

Floods and landslides killed at least 604 people in Indonesia, 366 in Sri Lanka and 176 in Thailand, according to authorities cited by AP. Many areas in Indonesia remain cut off after roads were damaged and communication lines went down. Aircraft are being used to deliver food and other supplies.

Many of the gravesites that pockmark the north and east of the country are believed to contain the victims of atrocities committed during the civil war. Caught between warring rebel fighters and the Sri Lankan army, the Tamil community in these regions bore the brunt of the violence.