The way you've placed those large expanses of desert and mountains has made for some interesting weather patterns. I've done my best to figure out how it all works, assuming the rules are anything like what they are on Earth.
First off, I think these lands lie in the Southern Hemisphere of their planet. (Either that, or their planet rotates backwards
relative to magnetic or arbitrary north.) South is roughly between the "right" edge of the map and the direction the first hexsides clockwise from the "top" are going (leaning towards the latter). That would make the map oriented East-by-Southeast.
The reason it has to be the Southern
Hemisphere is because of where the desert is in relation to the mountains and the forest, and the Coriolis Effect. It all comes down to the fact that the mountains need to block the Westerlies
to cause the "rain shadow" effect, meaning the mountains are west of the desert. But if Geshi is west of Fer, that makes Silvique to the south... And hence, all three are south of the equator.
I actually got to this point by mapping out the convection cells, trade winds, and westerlies. I even went and did the deep sea currents:
- Cyan: prevailing winds
- Dark Blue: cold water currents (the ones off the west coast of Geshi are the strongest)
- Dark Red: warm water currents (the one passing Silvique is a lot weaker than the one passing Fer)
- Dark Green: inner sea currents (these aren't particularly strong)
- Yellow: straights (the currents here would vary drastically based on tide, and I'm not sure which direction they'd flow)
From this map, I'm able to infer a few things about the different lands:
Geshi is going to end up looking a lot
like southern California. From the nearby coldwater current to the prevailing winds to the large mountain range to the volcanism, the conditions are nearly identical. Most of it is going to be pretty arid like the badlands, especially in the interior.
The most fertile ground will be on the southwest coast, where the winds bring rain and the currents bring fish. That port city would probably look a lot like Sacramento, and will probably be the fishing capitol of your entire (mapped) world.
The second-most habitable zones would be along the the southern and northeastern coasts. The currents around the northeastern coasts wouldn't be as bountiful, and the wind less moist, but in the balance I think it'd end up like Spain (north/east of Gibraltar). The best analogy I can think of for the southern coast would be Italy, Greece, or maybe Turkey.
Fer would have a climate similar to Australia mixed with both the north and
south ends of Africa, I'd expect. Not all of it will be completely
barren, though. For instance, everything south of the city printed in red should be more savannah/grassland than desert, with plenty of grasses and shrubs (even sparse trees).
That warm current off the east coast should be the second biggest fishing spot in Hersamo. And it's warm water, not cold, so the fish there will be completely different from the fish caught at Geshi (or off the west coast of Silvique, for that matter). The fish from here might even be seen as a luxury good, who knows?
Anyways, the lands north of ~30° S will all be dry, barren wastes; with the only possible exception being the westernmost peninsula where the straits with Geshi are the narrowest. Here, there might be enough moisture for a small trade port to exist. Maybe.
Finally, there's Silvaque. It seems to have the least variation, at least from what I can tell.
The majority of the mainland will probably resemble regions around the Mediterranean, with less deciduous trees and more stone pines
, fig trees, Junipers, and other such plants (which can survive in dryer environments. Farther South, however, the lands will start to resemble more France or Britain.
The West Coast would probably be the most fertile lands in Silvaque, resembling more than anything else the "Old South" region of America. The currents off this coast would also provide good fishing grounds, although not as prosperous as those off Geshi or Fer.
At least, that's my best guess as for what to expect of these lands. Climate being as complex as it is, I wouldn't be that surprised if I were wrong.