Pyongyang said the Tumen river, which partially marks the border with China and Russia, experienced the biggest flood ever recorded due to a rainstorm that began four days earlier.
Nearby areas including Musan and Hoeryong were hard hit, with 60 dead and five percent of the population homeless, the UN Office for the Coordination of Humanitarian Affairs said in a statement.
It cited data from the North's government.
Nearly 9,000 buildings were destroyed or damaged with 10,000 hectares (24,711 acres) of farmland flooded, it said, adding joint relief efforts involving the UN and the North were underway.
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The North's state media said Friday that 15 people were missing after over 17,000 houses were destroyed or damaged.
The impoverished nation is vulnerable to natural disasters, especially floods. At least 169 were killed by a massive rainstorm in the summer of 2012.
Its territory is largely composed of mountains and hills that have long been deforested for fuel or turned into terraced rice fields. This allows rainwater to flow downhill unchecked.
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