>>42556796Great question.
I want to make this clear right away. None of your ports are going to be ice free year round. I think it is reasonable for even the main ones to be frozen 4 months a year being generous. Some others will be frozen 8 to 10 months. Because the whole concept of Icebreakers actually doing anything in this period is completely ridiculous even in a magic world, this means that your nation has a window during the late spring summer and early fall to trade externally via sea.
Now, one of the options you actually do have I think is having roads on the ice during the winter that can take goods to say, one of NijiJPs ports in /rose/ or vice versa. I don't know how long that would take but it's feasible. (I know where they are, one is on the peninsula and on is on the big river. I can mark them on your map.)
Regarding land trade, it's not much better but I think your people would adapt to it over time. Snow and Ice is always an issue for them, but I am sure you guys probably develop methods to deal with them properly. A lot of your trade will likely come by land and you will have many caravans trekking through the conditions. But I also think that there will be a period where all types of trade are likely impossible, which leads your culture to have a tendency to stockpile goods and food in particular. I remember this being said, but a trade route up to Mujigae that would take you to sea trade from an ice-free port in the Golden Sea or up to Syrenia would do well for Anya and for Petra, you will have to go through Drakenland.
Unfortunately, not possible because Dragoon has his nation as an autarky and isolationist that refuses trade, but I think that we (the Empire) make them allow trade. or through /rose/ (Which is hazardous to say the least if you trade north through it, though crossing it to Ethyria along the south and then up to nenmen is a viable route imo..) For me, most of Petra's trade is by sea.
Interior, you would spend a lot on roads and the upkeep of infrastructure in general. It's a fantasy world, so use your imagination. Maybe make a snowblower from chuubanite or some kind of steam engine road vehicle that is dedicated to clearing roads. I know some would say you could do the same with icebreakers, but sea ice is much different and out of the question because Chuubanite isn't a magical "I can do all things" matter that breaks the laws of physics.