Answer:
The physical geography of Nubia is very similar to the physical geography of Egypt, only that it is even hotter and with more desert around. The Nile is also not as wide in this region.
This physical geography made Ancient Nubian civilization essentially an offshoot of Ancient Egyptian civilization, but with less development, and less wealth. However, the Nubians still managed to have a lot of influence on Ancient Egypt. For example, trade between Nubia and Egypt was very important, and several pharaohs were of Nubian origin.