Question

Which area was probably the largest source of gold for the Egyptians

Answer 1

This is what I found
The Nile River carries gold all throughout. Much of Ancient Egypt's gold was sourced from this massive river. The two significant sources of Egyptian gold was found in a place called Nubia toward the South and in the Eastern deserts. Much of this is now part of present-day Sudan.

Answer 2

Nubia near south and eastern deserts