How big was the Western Front in World War 1?

The Western Front during World War I stretched approximately 400 miles (640 kilometers) from the North Sea in Belgium to the Swiss border. It was a significant theater of war where Allied and Central Powers engaged in trench warfare, resulting in massive casualties and destruction. The front line shifted frequently, with major battles taking place in regions like Flanders, the Somme, and Verdun. This area became emblematic of the brutal and stagnant nature of World War I combat.