Kogin Mono shine babban kogin gabashin Togo Kimanin tsawon kilomita 400 (mil mi 250), kuma yana malale mashin kusan 20,000 km2 (7,700 sq mi), ya tashi tsakanin garin Sokodé da kan iyaka da Benin, kuma ya nufi kudu. A gefen kudancin kogin zuwa bakinsa, ya kafa iyakar ƙasa tsakanin Togo da Benin. Kogin ya shiga cikin Bight of Benin ta hanyar babban tsarin manyan lagoons na ruwa da tafkuna, ciki har da Lake Togo. Yankin kogin mafi kusa da bakinsa kawai ke iya tafiya. Yawancin gonakin kogin da ke saman tebur ana noma su ne don masara, dawa, shinkafa, auduga da rogo. Kogin ya lalata madatsar ruwa kilomita 160 (mii 99) daga bakinsa ta hanyar Madatsar ruwan Nangbeto, haɗin gwiwa tsakanin Benin da Togo da aka kammala a shekarar 1987. Bincike ya ba da rahoton fa'idodin tattalin arziki daga madatsar, gami da yawon buɗe ido da kamun kifi a cikin tabkin da ke bayansa. Ginin madatsar ruwan ya raba mutane 7,600 zuwa 10,000 da muhallansu, amma, kuma bincike ya nuna cewa ya canza yanayin yanayin lagoon a bakin kogin ta hanyar rage sauyin yanayi na yanayi na kwararar kogi.