You can see The Nile River Basin (Green) and a city. The starting city is in the north when you got the city correct a new city will appear towards south and so on. Good Luck!
You can always move on to the next city by using the up and down arrow!
It's a good thing you mentioned that you can skip to the next city with the down arrow. I couldn't get the first one and thought I was going to finish with 0!
Some more cities along the Nile itself could be added, such as Tanta, Al-Minya, Asyut in Egypt, Wadi Halfa, Dongola, Atbara and Kosti in Sudan, Malakal in South Sudan and especially Jinja in Uganda (source of the White Nile).
And there is one mistake: Bujumbura is outside the Nile Basin. It is located on Lake Taganyika which is part of the Congo Basin!
And there is one mistake: Bujumbura is outside the Nile Basin. It is located on Lake Taganyika which is part of the Congo Basin!