BenXC just did a video about IoA limits today, it has some good information in it. Nothing is really random apart from drops and monster taming, everything else has a set value/area.
If you're talking about story island town boundaries, there are three different cues for knowing when you're out of bounds. They first two towns are pitifully small though, considering all the stuff they want you to build.
Video:
Oh i know, the limits are not random, and I was talking about IoA limits, the other islands the limits are MUCH more undertandable (although from all the dialogue ive seen on the interent, the UI should be a little more clear (or be better explained in the turorial I suppose) of when you are out of it.
The problemis IoA doesnt have any UI that tells you were grren gardens ends and the snow part starts or if you are building in no mans land. The only way to exactly now were the limits are of those is building a room in the middle of what you think the frontier is, and start putting name signs on the walls. Depending of the area the sign is it will have the group of green gardens, the snow area or the desert araa to choose the name of who you want the room to be of. If only your name appears, its becuase that name plate is inside no mans land.
Yesterday night I start plopping small rooms everywhere on the map to see the limits of the island, and they are all over the place (sometimes they dont even make sense), it makes them a hassle for liberty of building and the game should have been more direct in telling you what they are.
I actually watched that video yesterday, the guy makes the best content of DQB on youtube thats for sure, too late for me putting house everywhere though lol
This was what I was trying to do BTW (+the new changed plans):
Was making an impressive medieval port just were the sea goes near the green gardens area and also touches the snow area. Thats no mans land (didnt know about it like one week ago) so all my work there has gone to the trash. The only thing I can do now is bring each of the big buidings in bluprints form, and make them in another area.
-Old Port with the old ingame sea: basically unusable by the NPCs.
-New Port and New Sea: Its going to look like trash becuase of the real sea elavation compared to that area but I really cant to anything. The port is going to look more like a river than a real sea one lol
-Old Farmland and New Farmalands: The old ones is were I had all my crops and the huge windmill and everything. That is going to be destroyed, truned into a natural park and move everything to the new (in a much lower level) farmland, so is better integrted with the medieval city and port. All the farm type NPCs and the animals will live here (so like 5 farmers and the animals, also adding a cook and a merchant so they can do their lives). The crop fields now will not be divided into different rooms so the limit of rooms is lower.
-Old Mountain and City: The mountain was destroyed becuase I thought weeks ago there were really no limits. Now its destroyed becuase it will look like the farmlands and the city are part of the same ecosystem, even if they are not. All of the rest of NPCS will live here, and will try to build most of the room in the game here.
-7 wonders: the desertland is where I will build unusable buildings that are beautiful (replicas of the ancient 7 wonders) but not usuable by NPCs, so no rooms inside them. MAYBE I put the epilogue guys living here, but thats a huge maybe, as maybe they need to live in one of the other islands.
I hope that makes the limits of actually having a working NPC city more feasible.
This is how the port that was in progress looked btw:
Theres like a open air bar in one of the conrers, that was basicaly no mans land and couldnt be used.
I was trying to recreate this port: