Around 700,000 people are now thought to be at risk in the area as torrential rains continue.
Pemba, regional capital of Cabo Delgado state, has experienced more than 2m (6.5ft) of rain and flooding.
Office for the Co-ordination of Humanitarian Affairs (Ocha) spokesman Saviano Abreu said the situation in the towns of Macomia and Quissanga was critical, adding that there were also worries for the cut-off island of Ibo.
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"We are very worried because, according to the forecasts, heavy rain is expected for the next four days," Deborah Nguyen, UN World Food Programme spokeswoman, told AFP news agency.
https://www.bbc.co.uk/news/world-africa-48087906