Thanks for the kind words, Ascension

As i said, i hope some of you will try your hands on it, even if it gets not picked for an official monthly challenge.

I have some additional geographical information to add:

There's likely some land beyond the island continents, but I have no idea what might be and neither do the inhabitants of the Summer Empire.
and a question and answer from the author:

Questions:
1. How much land is west of the mountains in the wild? A lot, like Eurasia, or smaller like say western North America?

Somewhere in between, but more like Eurasia.

2. How tropical do you want the Summer Empire? This will affect the size and shape of the continent, the more tropical the bigger the N-S axis, so that the taiga/boreal forest can be kept.

I was thinking the lower edge was warm (along the lines of Italy or Greece) rather than actually tropical.

3. The Gathans, I was thinking another island chain, kind of like Southeast Asia? Or more like a subcontinent, like India?

Definitely more like a subcontinent, possibly larger than India.