Kotto

The Kotto rises on the southern slopes of the Bongo massif and flows southwest towards the Ubangi. Rapids interrupt its course, which passes through steep gorges as well as flatter, swampy country where the river makes broad loops. Its waters join the Ubangi east of Mobaye, adding the drainage of the northern uplands to the great river system of the Congo basin.

The later city of Bangassou lies here.