Much of the fighting in World War I took place along the Western Front, within a system of opposing manned trenches and fortifications (separated by a "No man's land") running from the North Sea to the border of Switzerland. On the Eastern Front, the vast eastern plains and limited rail network prevented a trench warfare stalemate from developing, although the scale of the conflict was just as large.
What is the Western Front?
a system of opposing manned trenches and fortifications (separated by a "No man's land") running from the North Sea to the border of Switzerland.