The UN has analyzed the damage in Sri Lanka caused by the recent Cyclone Ditwah. It says one-fifth of the country's land has been flooded, affecting some 2.3 million people.

The cyclone lashed the island nation at the end of last month. The country's disaster management center says at least 639 people have been killed in flooding and landslides, and more than 190 remain missing.

The United Nations Development Programme, or UNDP, reported on Tuesday that the affected area covers over 1.1 million hectares, accounting for around 20 percent of Sri Lankan land.

The UNDP also says over 50 percent of the people in the flooded area were already struggling with unstable incomes and high debt, leading to concerns that the disaster will exacerbate their situation.

Kubota Azusa, the UNDP Resident Representative in Sri Lanka says: "Our goal is not just to recover. We want to make sure we build resilience while we do that so that communities can withstand further stocks and thrive." She called on the international community to cooperate to provide continued support.

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