Three weeks of heavy rainfall have left much of the country submerged and cost at least 70 lives.
More downpours are forecast for the south-west, with 400,000 people at risk. Dangerously full dams are being opened to ease water build-up.
Women and children are being moved to safer areas while men have been asked to stay to assist with relief efforts.
The south-western province of Khuzestan, which borders Iraq, is the main focus.
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