One thing I would note is that places like this tend to attact settlements. It could be that both river forks flow into different valleys. So the chances are the split happened at a place that is elevated sigifigantly from just a few miles down stream. The next feature that will be required is that both channels will need to be moving quickly enough that they resist a build of of silt that would normally close off one of the channels over time. You can see this happen in rivers where there are islands and short term splits like in the Grand Canyon. The split would have happened because the natural erosion of the river came in contact with this harder stone that resisted erosion and thus caused some of the current to be redirected to the other side. First in order for a split to last you need the river to flow through an area of hard rock that can resist weathering and erosion by fast moving water in the river. You are going to need some very specific feature for something like this to work long term. Having 2 major branches is not something that generally lasts. However usually over a long period of time (like 1000 years) one branch or the other will get silted in and turn become the minor branch. What you are talking about is called bifurcation and yes it happens. The world's recorded history spans for 1000 years and the rivers should stay as in the map at least for few more centuries. However, I don't know how long would this take and what could produce this phenomenon in the first place. However, as I understand geology, one of the river should prevail and make its channel so deep that the other river would get dry. The terrain around the rivers is covered by jungle, and it wasn't specified how flat or hilly it is, so I guess that there should be hills around but valleys where the rivers should flow. How likely is this to happen naturally? Is this even possible to occur and stay for more than 1000 years? Map legend: Galvina river (flowing from the north) splits into Galvina and Molana (the red circles), both flow into the sea. One of them is that one of the world's biggests rivers splits into two other rivers some 300-400 kms before reaching the sea, definitely before area where the delta should be expected. I inherited a worldbuilding project, and the former authors liked some things that seem unrealistic.
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