At least 21 people have died in floods in Iran.
Two more are still missing, Red Cross official Hossein Darwishi told state television on Saturday.
Heavy rains triggered the floods in Ij and Rudbal near the city of Estahban in southern Iran's Fars province.
According to the governor of Estahban, Jusef Kargar, 55 rescue teams were deployed.
The tragedy happened on a summer weekend in Iran, when many families seek cooler places like the banks of rivers and lakes.
Several residents and day-trippers were hit by the water masses on the riverbank, Kargar said.
Videos posted online showed cars being swept up in the swollen Rudbal River and washed ashore below.
Iran has experienced several droughts in the past ten years, but also floods again and again.
In 2019, at least 76 people died in severe flooding in the south of the country.
The flood caused damage estimated at more than $2 billion.
According to experts, climate change is increasing such extreme weather events.
In recent months, thousands of people have demonstrated in Iran because of the drying up of several watercourses.
In mid-July there were protests after the particularly salty Lake Urmia dried up.
This development, which began in the 1990s, is considered an ecological disaster.
Iran is also repeatedly hit by sandstorms, which mean that people with breathing difficulties have to be hospitalized.