I'm going to second the weird rivers thing. If I'm reading it right, and the blue is ocean, you have a river balancing on a peninsula. The lack of meanders suggests that there is a pretty consistent slope, which makes any of them not heading straight to the sea odd.

This could be the canal system of a fallen civilisation, but it does not look like a natural river formation.

I'm actually ok with the quick east west transition in Biomes, because cold water can do that. California is the best example, where you get extremely good food production not that far from death valley. Mountains limit how far inland the moisture gets, but a tendency towards strong westerly winds could also do it (though raises other questions as to how you get that combination).

The mountains are definite "a wizard did it" territory.