Which river was the cradle of the largest river valley civilization in ancient history in terms of geographic land area?

• Option B:
  The Nile River supported Ancient Egypt, which was historically significant and culturally influential, but its agricultural and settled area was primarily confined to the narrow Nile Valley and Delta, making its geographic footprint substantially smaller than that of the Indus Valley Civilization.
• Option C:
  The Amazon River is the largest river system in the world by water volume and basin size, but it was not the cradle of an ancient major river valley civilization comparable to those in South Asia, Egypt, or Mesopotamia.
• Option D:
  The Huang He (Yellow River) was the birthplace of ancient Chinese civilization. While highly influential, its territorial extent during ancient times was significantly smaller in area than the Indus Valley Civilization.

🚩Many students confuse the historical fame or monument scale of Ancient Egypt with geographic size and choose the Nile River. Remember, the question specifically asks about geographic land area, where the Indus Valley Civilization easily ranks first among ancient river civilizations.

Indus Valley Civilization = Largest ancient river valley civilization by geographic land area (~1–1.25 million sq km).