The Nile valley in Egypt had been home to agricultural settlements as early as 5500 BCE, but the growth of Ancient Egypt as a civilization began around 3100 BCE. A third civilization grew up along the Indus River around 3300 BCE in parts of what is now India and Pakistan (see Bronze Age India).
These rivers have existed in part of the world's oldest known civilizations:
- Mesopotamia (Tigris and Euphrates Rivers)
- Ancient Egypt (Nile River)
The Indus River has only been around about 4,500 years. The Yellow River has only been around about 2,000 years. This definitely crosses out these options.
