Apologies in advance for any formatting errors; this is my first post on this forum.

I've recently used the world painter tool to create a custom map that recreates the real-life island of Mauritius at as close to a perfect 1:1 scale as I can get. I chose Mauritius because from my research, it has the best ratio of land area to elevation range to fit into any of DF's available world sizes and 400 z-levels (going with the assumption that each z-level is 2.8 metres tall and each tile is 2 metres wide). I haven't gotten around to modding, but this would be the perfect map to play with modded-in dodo birds!
(See following posts for the worldgen file; hit character limit.)The other settings are mostly up to you, but it does need to be a 65x65 ("small") world, as with any custom map you should set the required region counts to 0 to avoid excessive rejections since not all biomes are present, and to avoid losing the mountains you should NOT "periodically erode extreme cliffs" (but a high "erosion cycle count" seems to work fine). While it isn't strictly necessary I also recommend setting a constant temperature of about 87 with no poles for an accurate climate, and I factored orographic precipitation into the rainfall map so I recommend turning that setting off for accuracy as well. Keep in mind for the other settings that a lot of this map is ocean since the main island is just a bit too big to fit onto the next smallest map size, so things might get crowded on the available land if you have a lot of civ sites, but you can add in fictional extra land yourself if you want to.
The real island that this map is based on:
https://en.wikipedia.org/wiki/Mauritius
*Edit: this still works on the Steam version.*