The passage is about the history of Khartoum and its surroundings, focusing on the Nile River and its importance. It mentions the confluence of the Blue Nile and White Nile, and the strategic location of Khartoum. The text also touches upon the local population, their customs, and their relationship with the river. It describes the river as a source of life and sustenance, and a means of transportation. The passage also refers to historical events and figures associated with Khartoum.