Apart from Cairo, which other capital city stands on the river Nile?
Correct answer: Khartoum

SPRITE
Addis Ababa is capital of Ethiopia
Sana'a is capital of Yemen
Riyadh is capital of Saudi Arabia

SPRITE
Player #1935809,
Yes, that's South Sudan (included in the explanation)

Player #1935809
Sudan no longer borders Kenya, Uganda, or Democratic Republic of Congo