The big one that stands out is the idea of a rain shadow. (snip) So let's say that you have eastern winds on your map. That would mean the area east of the mountains should have a bit of a rain shadow which allows only ecosystems with less water usage.
I'm glad you posted about this, because now I have a legit reason to do what I originally wanted to do with Evoid--make it somewhat barren/desolate. Or at least, part of it.
But I suppose that means that I'm going to have to add a WHOLE lot more forests to the Triannion side of the mountains, since places with lots of rain typically have forests.
Assuming this isn't a new continent only inhabited by animals, what are the primary industries? That is, how do the people living there make goods to barter? Where are the cities and how big are they (and how do they even survive?)? A medieval era world typically had its biggest and best cities near water sources. Mining industries were typically in mountainous regions. Lumber was pretty much a non-existent entity unless you've got waterways or an artificial engine (ex - diesel).
The cities--or at least, the ones we'll see during the story--will be marked by FE8 map sprites. I haven't particularly figured out how to map waterways in this particular style, as the brushes I used were actually photoshop brushes in image forum, so I couldn't use the line brushes that matched that style.
As for the questions, Triannos is typically a land of high trading, with plenty of ideal farmland for animal raising and plant growing. Mining is most certainly a thing in the eastern side of the mountains, while fishing and trading are the most popular industries near port towns. Evoid is a little different, thanks to its barrenness, and does have a bit of trouble providing for the needs of its people. (Part of the reason why it invaded Triannos to begin with.) The two eastern countries, divisions of Ceverstine, have...not really been expanded upon, if I'm being honest. The two islands in the south rely heavily on fishing and trading.
One would assume from all this that Triannos is the continent's "bread basket". It has multiple major rivers which give it access to trade, food, and can keep the area well defended from attacks. Meanwhile, I would assume that Evoid in its earlier years would have had an isolationist effect. That is, many nations would crop up and fight for control of the area west of the mountains while other nations might attempt an attack on those protected by the mountains, a properly built defence would make it difficult to attack. it being a unified region now means that it's very easy to keep hold of. Furthermore, the eastern edge of Evoid is likely an area of great concern to them. They have lots of metals likely sticking out of the ground due to the mountains and could forge lots of weapons from the resources, if suitable.
Very interesting to note. I might have to revise my history of Evoid a little, since this is honestly more interesting than what I already had planned for it. In fact, it just gave me an idea.
Thank you for your input!