(The Atlantic) - Over the past three days, three months' worth of rain has fallen on the Balkan region, producing the worst floods since rainfall measurements began 120 years ago. The flooding has affected huge parts of Serbia, and more than a quarter of Bosnia's 4 million people: The Bosnian government is warning of "terrifying" destruction comparable to the country's 1992-95 war. At least 40 people have died in the region, and tens of thousands of others have fled their homes, packing into buses, boats, and helicopters - many of them farmers leaving their livestock behind. There's an additional hazard: leftover land mines. Floodwater has disturbed known minefields and damaged some markers that had been placed there to warn people away.