The Dorba River is the only river in the continent of Mbo that foreigners have some experience with, since foreigners are allowed access to the city of Bawaaba Mbo, which lies on an island at the mouth of the Dorba.
The Dorba river runs northward from the vast interior of the continent, where it drains into the Bite of Kawala. The river is 5 miles across at the mouth and rumored to be navigable for a thousand leagues, the river dwarfs any other river outside of Mbo, even the Golden River of Valoria is not even a quarter the size. And the legends say it isn't even the mightiest river in Mbo, that there are others even larger further to ther West