Iran floods: Thousands evacuate homes as heavy rain forecast
The death toll currently stands at 70.
Heavy downpours are set to strike south western provinces and officials say they will release water from key river dams that are dangerously full.
Women and children are being moved to safer areas while men are asked to stay and assist with relief efforts.
In recent weeks, much of the country has been submerged and the death toll currently stands at 70.
Towns such as Susangerd, with a population of 50,000, will be left at risk, officials say. It is to be evacuated on Saturday, along with about five other communities in the province of Khuzestan.
Around 70 villages in the province have already been evacuated in the past week.
Energy companies in the oil-rich region have helped the relief effort by using pumps to remove water.
Extremely heavy rain began on 19 March, affecting about 1,900 cities, towns and villages. Thousands of roads, bridges and buildings have been destroyed.
So far, 86,000 people are living in emergency shelters, of which about 1,000 were airlifted to safety.
Aid agencies are struggling to cope with the scale of the crisis and Iran's state budget is under pressure due to US sanctions on energy and banking.
Foreign Minister Javad Zarif said the sanctions - reimposed after President Donald Trump withdrew from the Iran nuclear deal last year - had impeded aid efforts and caused a shortage of rescue helicopters.
"This isn't just economic warfare, it's economic terrorism," Mr Zarif tweeted on 1 April.
The government has promised that those affected, especially farmers, will be compensated for their losses.
The head of Iran's elite Revolutionary Guards said the armed forces were "using all their power" to minimise damage.
Are floods linked to deforestation?
By BBC Reality Check
Environmental experts believe that deforestation has been one of the major causes of flooding in recent years in the country.
According to Iran's Natural Resources and Forestry Organization, widespread and unregulated deforestation has destroyed around half of Iran's northern forests, areas where major floods have occurred.
According to the organisation, the northern forests area has been reduced from 3.6 million to 1.8 million hectares during the past 40 years.
