Yellow

The Yellow River is one of several rivers that are essential for China's very existence. At the same time, however, it has been responsible for several deadly floods, including the only natural disasters in recorded history that have killed more than a million people. The deadliest was a 1332-33 flood that killed 7 million people. Close behind is the 1887 flood, which killed anywhere from 900,000 to 2 million people, and a 1931 flood (part of a massive number of floods that year) that killed 1-4 million people.-wikipedia "Yellow River"