How big was the map before the collapse of the Soviet Union

At its largest (after World War II-1991) 22,402,200 square kilometers. There were several territorial changes in the Soviet Union. Before and after World War II, the Soviet Union annexed the Karelia region of Finland, Estonia, Latvia, Lithuania, K?nigsberg (present-day Kaliningrad), and the Thousand Islands, increasing its total area by about 700,000 square kilometers, which resulted in a staggering 22,402,200 square kilometers. As shown in the picture. Hope to adopt

(Image from the Internet)