Short answer: one generation covers a single continuous area

You can’t combine far-apart places into the same generation. TopoBlocks’s “real map → world” reads OpenStreetMap public data (building footprints, roads, waterways) and open elevation from a single continuous rectangular area per generation, then uses the open-source Arnis to rebuild it into an importable .mcworld. If you box two far-apart places (different cities, for example) into the same rectangle, the space between them will be a vast stretch of terrain with almost no content — unrealistic, and it makes the covered area (and the area-tiered price) suddenly very large.

So the correct way to think about it is this: the distance between the places decides whether it can be done in one generation, not the “number of places” itself. To understand how the area and pricing are figured out, see how big a real-map world can be and how area is priced.

Places that are close: enlarge the box and do one generation

If the places you want already sit next to each other (a few adjacent blocks in the same city, say, or several connected landmarks in one scenic area), they can fit inside one rectangular box, so you can do them in a single generation — just enlarge the selection box until it covers all your targets.

Keep in mind:

  • A bigger box means a bigger area. Pricing has 6 tiers by area (roughly 0.2–500 km²), and enlarging the box can push you into a higher tier. Exact prices are shown in the app.
  • Check it for free before generating. Before every generation you get a free map quality score and a low-resolution 3D preview. The quality score is an estimate of data coverage, not a guarantee of accuracy; the generation is an approximate reconstruction from public data, not a block-by-block replica of real buildings. Look at the preview to confirm the area and coverage are right, then decide whether to generate.

To aim the box precisely at a target, you can box by coordinates — see generate a Minecraft world from latitude and longitude coordinates.

Places that are far apart: generate separate worlds

If a few places are far apart and can’t be enclosed by one reasonable rectangle, the workable approach is to generate a separate world for each place: search and box each one separately, and you get an independent .mcworld for each.

  • Each world is its own file. TopoBlocks does not offer a feature to stitch or merge multiple worlds into one map; each .mcworld it generates is independent and can be imported into the game separately.
  • Never overwrites. Generations don’t affect one another — each one creates a new file and keeps a traceable version, and it never overwrites an existing world.

If your real goal is “turn a whole patch around my home into one world” rather than stitching across cities, one selection box is usually enough — see turn the blocks around your home into a Minecraft world.