River deltas are perhaps the most vulnerable places on Earth to flooding, because they're made of sediment brought by the river which drops as soon as the flow slows, meaning that the banks of sand and silt are barely above sea level. The Mississippi delta, the delta of the Rhine-Maas (The Netherlands), the Nile, the Ganges (Bangladesh with its 110 million people), the Mekong, Pearl River, Yangtse ......
From a tweet by Simon Kuenstenmacher
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