<p><strong>Noun</strong></p><ul><li>A republic in NW Africa: formerly part of French West Africa.</li><li>Area: 458,976 sq. mi. (1,188,748 sq. km).</li><li>Niamey: the capital city.</li><li>A river in W Africa, rising in S Guinea, flowing NE through Mali, and then SE through Nigeria into the Gulf of Guinea.</li><li>Length: 2,600 miles (4,185 km).</li></ul>