Kogin Neja wasu kan kirata da Kogin Nijar na da tsawon kilomita 4,180. Zurfinta marubba’in kilomita 2,117,700 a kasa. Matsakaicin saurinta 5,589 m3/s wanda ya bambanta daga saurin 500 m3/s zuwa 27,600 m3/s. Mafarinta daga tsaunukan Gine, a kudu maso gabashin Gine. Kananan rafufukanta su ne kogin Bani, kogin Sokoto, kogin Kaduna da na kogin Benuwe. Ta bi cikin Mali, Nijar da Najeriya zuwa Tekun Atalanta wanda ta bi Neja Delta. Waɗannan biranen na samuwa a gefen kogin Neja: Tembakounda, Bamako, Timbuktu, Niamey.

Nijar (kogi)
Niger River View, Djenne (6861797).jpg
General information
Tsawo 4,180 km
Labarin ƙasa
Niger river map.svg
Geographic coordinate system (en) Fassara 9°04′56″N 10°43′24″W / 9.0822°N 10.7233°W / 9.0822; -10.7233Coordinates: 9°04′56″N 10°43′24″W / 9.0822°N 10.7233°W / 9.0822; -10.7233
Kasa Benin, Gine, Mali, Nijar da Najeriya
Hydrography (en) Fassara
Tributary (en) Fassara
Watershed area (en) Fassara 2,117,700 km²
Drainage basin (en) Fassara Q87063973 Fassara
Tabkuna Kainji Lake (en) Fassara
River source (en) Fassara Gine
River mouth (en) Fassara Gulf of Guinea (en) Fassara
Kogin Neja a Kulikoro, Mali.
Harkar kasuwanci a garin Boubon na bakin kogin neja a Jamhuriyar Nojar.
Kogin Neja da gadar Lokoja a Najeriya.