Officials in Indonesia and Sri Lanka battled Wednesday to reach survivors of deadly flooding in remote, cut-off regions as the toll in the disaster that hit four countries topped 1,300.

In Indonesia, there is growing frustration among survivors of catastrophic flooding and landslides over the pace of the rescue effort and aid delivery.

Humanitarian groups said the scale of the challenge was almost unprecedented even for a country that has faced no shortage of natural disasters.

Monsoon rains paired with two rare tropical storm systems, sometimes known in the region as cyclones, dumped record deluges across Sri Lanka, and parts of Indonesia's Sumatra, southern Thailand and northern Malaysia last week.

In Indonesia, the toll hit 753 on Wednesday, but the number of missing also increased

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