totally need this

Please make this a thing

If you want this to be a workshop feature, this would be something for the devs, although for this to be a mod, there are some restrictions; for security concerns, mods are not allowed to access the System.IO library, basically mods cannot read, or write files directly. This means it won't be like importing/exporting maps/saves by sending a file to eachother, one thing that mods do have access to however, is Copy-Paste functionality, so what can be done is, when you're on a world, and you click Ctrl-C it copies a bunch of text that basically defines your world in its current state, essentially a save, and you can text/message that text to a friend and pasting that into the world should load your game.
If you like we can also adjust it so that it doesn't import/export a save of the world but rather just the geography of the map, not the buildings and peasants and anything else.

I don't really need the peasants and buildings. But if I spend a few hours carefully sculpting the geography (water tiles, forest tiles, resource tiles, soil qualities etc.) of a map tile by tile, I'd like to be able to use that geography again and allow others to do so.

It has been some time since this thread, but I have finished a mod that allows this, you can find it here:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2361677367