The 1931 Yellow River flood (Huang He flood) is generally thought to be the deadliest natural disaster ever recorded, and almost certainly of the twentieth century (when pandemics are discounted). Estimates of the number of people killed in the 1931 flooding range from 1 to 2 million. Deaths caused by the flooding include but are not limited to drowning, disease, ensuing famines, and droughts. Lesser population densities in prehistoric times make it unlikely that this toll had previously been surpassed. Mount Pinatubo eruption, 1991 A natural disaster is the consequence of the combination of a natural hazard (a physical event e. ... (19th century - 20th century - 21st century - more centuries) Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s The 20th century lasted from 1901 to 2000 in the Gregorian calendar (often from (1900 to 1999 in common usage). ... A pandemic (from Greek Ïαν pan all + Î´Î®Î¼Î¿Ï demos people) is an epidemic (an outbreak of an infectious disease) that spreads across a large region (example a continent), or even worldwide. ...