As Bosnia and Serbia battle the heaviest rain and worst floods since records began 120 years ago, states of emergency have been declared in several parts of the country.
Overflowing rivers have burst into towns and villages, cutting off whole communities, while landslides have buried houses.
At least three people have drowned.
Army helicopters have been sent to evacuate thousands of stranded residents but reports say bad weather is hampering the rescue efforts.
Serbia's Prime Minister, Aleksandar Vucic, said it was the "greatest flooding disaster ever".
He said his government had appealed for help from the European Union, Russia and Neighbouring countries.
Rescuers in Serbia say they have so far managed to evacuate around 4,000 people.
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