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

The maximum time (-19965438+ 0 years after World War II) is 22,402,200 square kilometers. There have been many territorial changes in the Soviet Union. Before and after World War II, the Soviet Union annexed the Karelia region of Finland, Estonia, Latvia, Lithuania, Konigsberg (now Kaliningrad), Kuril Islands and other regions, with a total area of about 700,000 square kilometers, thus making the area reach an astonishing 2,240.22 square kilometers. As shown in the figure. Hope to adopt

(Image from the Internet)