Final answer:
The German defense fortification against an Allied invasion in World War II was known as Hitler's "Atlantic Wall." Designed to impede an Allied landing, it included various defenses such as beach obstacles, bunkers, and landmines along a 2,400-mile-long stretch of coastline.
Step-by-step explanation:
The name of the German defense, a 2,400 mile-long fortification, against an Allied invasion in World War II is known as Hitler's "Atlantic Wall." This extensive network of coastal defenses that stretched from Norway down to the French border with Spain was intended to prevent or at least impede an Allied invasion, serving as a formidable barrier with beach obstacles, bunkers, and landmines to thwart enemy forces. It was part of Germany's strategy to defend the European continent from the anticipated invasion by Allied forces, which mainly constituted British, Canadian, and American troops.