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The phenomenological mathematical model of COVID-19 spreading is proposed forlarge countries with geographical differentiation of population density.According to the model COVID-19 spreading takes the form of severalspatio-temporal waves developing almost independently and simultaneously inareas with different population density. The intensity of each wave isdescribed by a power-law dependence. The parameters of dependence aredetermined by real statistical data at the initial stage of the disease spread.The results of the model simulation were verified using statistical data forthe Republic of Belarus. Based on the developed model, a forecast calculationwas made at the end of May, 2020. The accuracy of forecasting the total numberof cases for a period of 3 months in the proposed approach was about 3 percent.

Power-law multi-wave model for COVID-19 propagation in countries with nonuniform population density