The Marshall Islands are vulnerable to flooding
A state of emergency has been declared in the Marshall Islands as widespread flooding displaced hundreds of people.
The islands have been pounded three times in two weeks by powerful waves caused by storm surges and high tides.
The floods have swamped the main urban centres of Majuro and Ebeye which are less than a metre above sea level.
Government officials said the flooding showed how vulnerable the western Pacific atoll nation is to small changes in weather conditions.
Fears for public hygiene have intensified as the floods also hit cemeteries, "contributing to the already alarming sanitary conditions with the widespread debris caused by the high wave action", President Litokwa Tomeing said.
The president said at least 600 people were forced to take refuge in government-designated shelters, churches, and with other family members.
Radio Australia interviewed the government's chief secretary, Casten Nemira, who said damage to outer islands remained unknown until communication with them could be restored.
"Over 200 plus houses were affected and some houses are completely damaged, also the cemeteries by the shore lines and erosions," he said.
"We hope to get a complete picture in the coming days as the reports are still coming in."
Deborah Manase, deputy director of the Office of Environmental Planning and Policy Coordination, said damage had been caused despite the waves that crashed into the islands being "quite small" at about five feet.
"It shows that we're extremely vulnerable," the AFP news agency reported her as saying.
"If the tide had been two feet higher, it would have been much worse.
"At the global level, we're trying to explain that the smallest change in sea levels will have a big impact on our islands."