I've started planning and mapping the area around Trade City (including the city itself), also known as Northern or Central Argaes. This will expand map 055-1 and 056-1 and replace 057-1 completely. My overall layout is roughly based on
what the wiki has, but with notable changes that I will list here. Trade City will be coastal (on what I'm calling Argaes Bay). The eastern pass will have a military checkpoint separating this area from the dangerous plains to the east. The farming village is being merged with a fishing village on the north west coast, in a break in the mountains. The lake is still there (called Lake Mistrala), but it drains in two directions, south past the west wall of Trade City, and east to the military checkpoint and into the plains; it extends east quite a ways. There will be a lake-side castle the uses the east river as part of it's moat (the lake forming another part) and backed by the mountains; there is some open land east of the castle that I'm not sure what to do with yet. Along both sides of the south river and going west will be farming area. Also in the west will be another military checkpoint/outpost. Most of this area will be a level above sea level, with the City, two military checkpoints, and the farming/fishing village as the only ways in (other than caves), due to the cliffs separating it from the bay. There will be a road leaving the City going east, ending at the eastern checkpoint, with largish estates lining both sides. There will be a road going from the east checkpoint, in front of the castle (and connecting to it), over the south river, and to the farming/fishing village. Another road will go from the farming/fishing village south, through the west checkpoint and to the coast, then heading east to current maps, and west to the City. I'm not sure about having a third road leaving the City going north. The city will be multilevel, being built into the cliffs.
I've attached the current work here (and spoilered it because of how large it is, even at 25% zoom).
The grey area to the west is where the City will be. The north/south road up to the fence will be part of the expanded 055. 056 will be expanded north and east with some more content (including another warp from 055 at the cliffs west of the n/s road). The west checkpoint will be a little bit north of where 055 now ends, along that road.
Directly west of the city is a mostly open, coastal plain. This will be the largest map in the game so far (unless another gets released first). The waterfall cave to the west will link to another entrance on top of the cliffs. The cave to the east will have a lot of water in it, linking to that pool (I'm going to work on a tile to go there). The little island near the city only has dead trees on it and would be good for a small quest (maybe relating to dark magic). This map will have some stables near the City; once mobile NPCs are working, I'd like to have a few riding mouboos (or whatever we end up with here) wandering around.
East of the city will be a smaller beach area.