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In page Niamey:

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The Niamey region straddles between the Liptako, corresponding to the northern extremity of the East ridge of Man, and the south-western edge of the Iullemmeden basin.[1] Covering an area of over 250 km2 (97 sq mi), the metropolitan area sits atop two plateaux reaching 218 m (715 ft) in altitude, bisected by the Niger River. At Niamey, the river, running almost straight SSE from Gao, Mali, makes a series of wide bends. The city grew on the east ("left bank") of the river as it meanders from west to east flow to run almost directly south. A series of marshy islands begin at Niamey and extend south in the river.[citation needed]