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Papua New Guinea's National Weather Office has issued a flood warning for the capital Port Moresby and surrounding villages.
The office has told the Post Courier newspaper that they are expecting the highest rise in sea levels ever seen in the area.
The highest tidal surge is expected to be 2.89 metres above sea level, and is likely to cause widespread flooding in the lowlands.
The high tides began Monday and will rise and fall dramatically over the next two weeks.
Last month, the PNG government declared a national disaster after a combination of king tides and high seas displaced tens of thousands of people across seven provinces.
