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
Fishing in Chad Cameroon, the surplus catch was dried, salted, or smoked before being sold. Between 1976 and 1985, production of dried, salted, or smoked fish was estimated at 20,000 tons annually, representing from 20 to 25 percent of Chad's total annual catch. A large share of the commerce in preserved fish was carried on with markets in Cameroon and Nigeria. Small dried or salted fish called salanga were most popular on the markets of Cameroon. Larger smoked fish called banda were generally exported to the major Nigerian market of Maiduguri. Through the mid-1980s, Chad had taken few steps to control or modernize