Geography
The wetlands lie in the Yobe-Komadugu Basin. They are formed where the Hadejia and Jama'are rivers meet lines of ancient sand dunes in a northeast-southwest alignment and break into numerous channels. They are drained by the Yobe River, which flows east towards Lake Chad. They lie between Sudanian Savanna to the south and the drier Sahel to the north. Some of the land is permanently flooded, while other parts are flooded only in the wet season (August and September). Annual rainfall ranges between 200–600 mm, during the period late May–September. At one time the wetlands may have covered up to 3,000 km2. Between 1964 and 1971 over 2,000 km2 were flooded. By 1983 less than 900 km2 were flooded, and less than 300 km2 were flooded in the drought year of 1984.
Read more about this topic: Hadejia-Nguru Wetlands
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