Since you some-what liked my idea about the planes ....
Here is a ruff full view of what I see....
Feel free to use any or none of this advice..
- Click image to enlarge.

CONGO RIVER - unpassable.
Must cross river by boat or plane.
STARS - are cities
Five stars are adjacent to the Congo River
(KSH, Lisala, Kinda, Kasongo, Kalemie)
All of these are connected one-way from upstream to downstream
Any city upstream can move to any other city downstream - but
downstream cities can not move upstream.
In each city are colored planes. Each city has a two-way connection to any other city with the same color plane in it.
CIRCLES - Forests of the Cango
You can not access the River Route from a forest, you must enter a city or Rebel camp.
Forests are connected to all neighboring forests and to any camp or city with-in it.
Except if the river splits between one forest and another. No one can move from one Forest across the river to another forest, they must cross river by boat or plane.
SQUARES - Rebel Camps "Rebel Camps can be labeled "R1, R2, R3, ect" do not need long names.
Many rebel camps or poachers can be seen along the river bed.
For a price they can take you upriver only to the next adjacent rebel camp or any adjacent river cities.
They can also take you down river to any other Rebel Camp or City.
You can not maintain control of any Rebel Camps - at the start of your turn if any troops left in a rebel camp - they are killed and the rebel camp turns back to neutral.
((Downriver they can go to any city or camp - but using the rebels to move upstream you can only move to the next adjacent rebel camp and/or city for traveling upstream takes longer and is harder.))
I'd also probably add more circles in the areas that are split by the river, have a circle in each section of that forest on each side of the river - For I think it would be cool if the river was unpassable unless by plane or boat. So that any part of the forest can be accessed in some way. They could simply be labeled (A, B, C) of what ever area they are in.
Also maybe 3 or 4 scattered bonuses that might be prime poacher sites or blood ruby mines.
These are just a few ideas - do what you will with them...