Geom. mean estimate[1] Lowest estimate Highest estimate Event Location From To Notes 7007136847000000000♠13,684,700 7007136847000000000♠13,684,700 7007136847000000000♠13,684,700 Nazi Genocide of Soviet Slavs Nazi occupied Europe and Russia 1939 1945 The Nazi Regimes extermination of Slavic peoples and citizens of the USSR.