I'm not a river expert, so I'll defer to those who are, but I do have a question about one of the rivers here.

It looks as if the Bakhr River is a tributary to the Styx where they meet, but on the southern end of the Bakhr it becomes a delta feeding the Purple Lotus Swamp and Lake Zuad, with something of an Okavango flavor. Assuming the Bakhr can't flow in two directions at once, how is it splitting off from the Styx?