Ultimately it is your world and you decide the laws by which it abides.

That being said, if this was Earth I would be confused -- I am associating the trees with higher atmospheric moisture content, and it just seems like there is not very much geographic consistency. Near rivers makes sense, on the windward side of mountains, and so on. This entails making a world building element of ocean currents and jet streams. Just imagine where the wet air would be and, as Azelor said, it seems relatively unpopulated save for the one city, so there is the potential for massive forest growth. As far as rivers are concerned, they seem well positioned.

But once again, its your world and I don't claim to know how the ecosystem there works. And finally, this is an amazing map! It really gets my imagination running.