Chad Basin demand for ivory, but stocks have since recovered. The seasonal Korama River in the south of Niger does not reach Lake Chad. Nigeria includes two sub-basins that drain into Lake Chad. The Hadejia - Jama'are - Yobe sub-basin in the north contains the Hadejia and Jama'are rivers, which supply the Hadejia-Nguru wetlands. They converge to form the Yobe, which defines the border between Niger and Nigeria for , flowing into Lake Chad. About of water reaches Lake Chad annually. Construction of upstream dams and growth in irrigation have reduced water flow, and the floodplains are drying up. The Yedseram -
Rail transport in Chad N'Djamena to Moundou and Koutéré on the Cameroon border (528 km), and one from the capital to the border with Sudan (836 km) via Abéché and Adré. The lines are to be built to standard gauge and for 120 km/h running, and equipment for the line will be sourced in China. Rail transport in Chad Up to 2012 Chad had no rail system. Two lines are planned to Sudan and Cameroon from the capital with construction expected to start in February 2016 and be complete in 4 years. A 1905 book describes the history of a German railroad syndicate's exploration