Thousands of people crammed into boats and army trucks have fled their homes in Serbia and Bosnia after record rainfall turned the Sava river into a deadly torrent and caused the worst floods in more than a century.
According to officials in both countries, the disaster has killed at least 44 people.
Some towns have been completely cut off and rescue teams feared the worst as improving weather allowed them to move in.
Some 10,000 people have been evacuated so far from the worst affected areas of northern Bosnia. In the town of Samac, hundreds of stranded residents were waiting to be rescued.
"We sent rescue teams into a part of the city we had not been able to access so far. They are entering those areas fearing what they might discover," Mayor Samo Minic told reporters on Sunday.
The worst rainfall since records began in the late 19th century caused landslides that brought more destruction and also prompted a landmine warning.
Bosnia's de-mining agency said residents around the towns of Doboj, Maglaj and Olovo - which saw fierce fighting during the war in the 1990s - should be particularly wary.
Twenty of the 27 deaths recorded in Bosnia occurred in Doboj while on the other side of the Sava river, in Serbia, at least 16 bodies were found.
In the town of "Obrenovac alone we recovered 12 corpses", Prime Minister Aleksandar Vucic said, bringing the toll in Serbia to 16.
"Unfortunately there are estimates that the death toll will be higher," he said.
Croatia has also confirmed one casualty, as a result of bad weather that engulfed much of central and parts of eastern Europe at the weekend.
Ukraine emergencies ministry said electricity had been cut to about 100 villages in the north and west because of heavy rains and winds but that no casualties had been reported.
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