I assume your connection problems were keeping the map from loading based on the modem distance thing. I've split the map up into four pieces to make it easier to load at all
((First of all, wow. Holy crap that is awesome!
Second, is that orange stuff desert? Why is there so much desert in the middle of what I assume to be a forest? What about that yellow stuff? A legend for the terrain would be nice.
Thirdly, you got the geography of the human settlements wrong. After the Angel-Emperor revealed himself, he united all other humans and centralised the race's entire population (on Keshan, at least). This allowed for two Attack on Titan style walls to be built around its entire territory. They're basically Great Walls of China except much larger and they're actually supposed to keep enemies out.))
Concentrating 3 million humans previously scattered all over the world into such a small, contiguous area with the current technology level is frankly implausible. I've already taken some liberties with population and relative ability to even appear on the map so as to make it interesting and stuffing so many humans would basically amount to godmoding and ruin the whole point of this exercise. The map only measures around 40 miles/70 kilometers on a side, and, assuming Earth-like size and land proportions, occupies only 0.003% of the land area. Also, I mostly trust the DF world generator's judgment on placing most of the settlements.