Food supplies are dwindling for more than 5000 villagers in Central Bougainville as a result of continuous heavy rain.
Food gardens in the coastal village of Rorovana have been washed away and an appeal has gone out for emergency government assistance.
Regional disaster coordinator, Franklin Lacui, told Radio Australia's Pacific Beat a long term plan to help the villagers relocate has been put into action, but decisions are yet to be made on the immediate issue of food aid.
"The situation is quite bad for the immediate community disadvantaged by the flooding of a big river near there," he said.
"This situation has given these people quite a hard time for a while now.
"We have talked with the chief of the area to relocate."
Mr Lacui said he was waiting for a report on the situation from the district administration, which he will then table at the Bougainville Disaster Committee meeting on Tuesday.
He said people had begun harvesting and eating food - including bananas and tapioca - that had been uprooted by the flooded river.
- Australian Broadcasting Corporation
- © ABC