How long was the front line when Germany invaded the Soviet Union in June 1941?

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Eastern Front Red Army soldier waving the Soviet flag during the Battle of Stalingrad.

When Germany launched Operation Barbarossa on June 22, 1941, the invasion took place along a front line that measured approximately 1,800 miles (2,900 km) in length.1

This massive offensive, which marked the beginning of the Eastern Front during World War II, caught the Soviet leadership by surprise and involved the largest and most powerful invasion force in history.12