Nigeria Sudan savannah is similar but with shorter grasses and shorter trees. Sahel savannah consists of patches of grass and sand, found in the northeast. In the Sahel region, rain is less than per year and the Sahara Desert is encroaching. In the dry northeast corner of the country lies Lake Chad, which Nigeria shares with Niger, Chad and Cameroon. Nigeria's Delta region, home of the large oil industry, experiences serious oil spills and other environmental problems, which has caused conflict. Waste management including sewage treatment, the linked processes of deforestation and soil degradation, and climate change or global warming are
Rail transport in Chad government to build a line that would open the colony’s interior to trade. The syndicate sponsored expeditions in 1902–3 and 1904 to survey the projected route. Several plans or proposals to build railways during the French colonial period (French Equatorial Africa) in Chad, and to connect Chad to other African railway networks (Cameroon, Nigeria, Oubangui/Central African Republic). Early proposals include a line extending from the Cameroon rail system at Douala into Chad in the 1930s. One early unofficial plan was a study for a railway from Douala in Cameroon to Bangui, which was part of the pre-World War I German