I'm working on the map right now and the city locations, especially for the upper Nile, are quite confusing. Especially how Puput is both on the east bank and due south of Jary, but also right at the edge betweent the delta and the narrow river. That location is literally Cairo, but then that would be north of your actual desired location, although it is south of a city based in the river fork, to the northwest of Cairo.