Kogin Ogooué (ko Ogowe), wanda kuma aka fi sani da kogin Nazarat, kimanin kilomita 1,200 (tsawon mi mil 750), shine babban kogin Gabon da ke yammacin Afirka ta tsakiya kuma shine kogi na biyar mafi girma a Afirka ta hanyar yawan ruwa, wanda ke bin Kongo kawai, Kasai, Niger da Zambezi. Ruwan ruwanta ya malale kusan duk ƙasar Gabon, tare da wasu mashigan ruwa zuwa Jamhuriyar Kongo, Kamaru, da Equatorial Guinea. Kogin Ogooué ya hau arewa maso yamma na Bateke Plateaux kusa da Kengue, Jamhuriyar Kongo. Yana gudana arewa maso yamma, kuma ya shiga Gabon kusa da Boumango. Poubara Falls na kusa da Maulongo. Daga Lastoursville har zuwa Ndjole, Ogooué ba mai iya kewaya shi saboda saurin gudu. Daga garin na ƙarshe, ya yi yamma, kuma ya shiga Tekun Gini kusa da Ozouri, kudu da Port Gentil. Yankin Ogowe Delta yana da girma sosai, kusan tsawon kilomita 100 kuma faɗi kilomita 100. Kogin Ogooué yana da murabba'in kilomita 223,856 (sq mi 86,000), wanda daga ciki murabba'in kilomita 173,000 (67,000 sq mi) ko kuma kashi 73 cikin 100 yana cikin Gabon.