Khartoum is currently located in the heart of the city. A new international airport is currently being built about south of the city center. There have been delays to start construction because lack of funding of the project but it is expected that the airport will be completed sometime in 2018. It will replace the current airport in Khartoum as Sudan's main airport. Bridges over the Blue Nile connecting Khartoum to Khartoum North: Khartoum has rail lines from Wadi Halfa, Port Sudan on the Red Sea, and El Obeid. All are operated by Sudan Railways. Some lines also extended to some
Siege of Khartoum to the north by the Blue Nile and to the west by the White Nile. To defend the river banks, he created a flotilla of gunboats from nine small paddle-wheel steamers, until then used for communication purposes, which were fitted with guns and protected by metal plates. In the southern part of the town, which faced the open desert, he prepared an elaborate system of trenches, makeshift Fougasse-type land mines, and wire entanglements. Also, the surrounding country was controlled by the Shagia tribe, which was hostile to the Mahdi. By early April 1884, the tribes north of Khartoum rose in