The Killing Fiels were a number of sites in Cambodia where large numbers of people were killed and buried by the Khmer Rouge regime, during its rule of the country from 1975 to 1979. At least 200,000 people were executed by the Khmer Rouge (while estimates of the total number of deaths resulting from Khmer Rouge policies, including disease and starvation, range from 1.4 to 2.2 million out of a population of around 7 million). In 1979 Vietnam invaded the country, which at that time was officially called Democratic Kampuchea, and toppled the Khmer Rouge regime.