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At least 631 people have been killed in Indonesia alone. With many areas across the island of Sumatra still inaccessible, local authorities have said they expect the death toll to rise. Many parts of the island have been buried in landslides, following flash floods which have made roads impassable and impeded search and rescue efforts.

The death toll from flooding and landslides across parts of Asia climbed past 1,600 on Dec. 1, as hardest-hit Sri Lanka and Indonesia deployed the military to help survivors.

Separate weather systems brought torrential, extended rainfall to the island of Sri Lanka and large parts of Indonesia's Sumatra, southern Thailand and northern Malaysia last week