Kogin Ubangi (/ (j) uːˈbæŋɡi /), wanda aka rubuta shi ma Oubangui, shi ne mafi girman raƙuman ruwa na Kogin Congo a yankin Afirka ta Tsakiya. Yana farawa ne daga mahadar Mbomou da Uele Ribers kuma yana gudana zuwa yamma, ya zama iyakar tsakanin Jamhuriyar Afirka ta Tsakiya (CAR) da Jamhuriyar Demokradiyyar Kongo. Bayan haka, Ubangi ya karkata zuwa kudu maso yamma ya wuce Bangui, babban birnin CAR, daga nan sai ya bi ta kudu - ya zama iyaka tsakanin Jamhuriyar Demokradiyyar Kongo da Jamhuriyar Kongo. Ubangiarshe Ubangi ya haɗu da Kogin Kongo a Liranga. Tsawon Ubangi yana da kusan kilomita 1,060 (660 mi). Jimlar tsawonsa tare da Uele, mafi karancin harajin ta, ya kai kilomita 2,270 (mil 1,410). Tafkin ruwan Ubangi yana da kusan kilomita murabba'i 772,800 (298,400 sq mi). Sakin fitowarta a Bangui ya fara ne daga kimanin mitakyub 800 a sakan daya (28,000 cu ft / s) zuwa mita 11,000 a sakan daya (390,000 cu ft/s), tare da matsakaita kwarara kusan mita 4,000 a sakan daya (140,000 cu ft/s).