The Great Lakes Union of Urbanized Economic Developers aka Chitroit
These are not regions, these are cities. There are many, smaller, less efficient cities but their populations are in the low tens of millions and barely worth mentioning. The SuperCities, largest of the “ShipCities” are entirely airtight catacombs of self sufficiency and industry. Frequently referred to as “shitties” and “supershitties” in informal company, they are numerous and varied around the world. Less than 0.001% environmental damage outside of the city seals, despite there being over 51 billion humans on the earth. The cities are miracles of modern engineering. They combine the womb-like nature of a space ship with the limitless resources and labor force of a desperate planet. Europe and Asia look very similar, with major population centers grown out of the antiquated cities of yesteryear. Tokyo and Chunnel are particularly magnificent, each housing populations in excess of 10 billion. Many of the cities like Florida are underwater or partially underground. This is to avoid the incredible toxicity of the atmosphere, and the highly acidic rain it produces.
It is the year 2233 and Humanity has been reaching out into the stars for almost 100 years. In fact, today marks the 100th anniversary of a human surviving The Traverse. The Traverse is what we came to call the barrier between distances when warping and folding for faster-than-light flight. We’d been able to send anything through for three years before we found a way to survive it. The first man to survive was later released after suspicions of mental instability in a scandal involving his then divorce and eventual suicide. Court documents indicate he had begun prepping for the end of the world as we knew it, and encouraged his wife and even close friends to go with him and leave “this tiny, spinning wheel.” After a few tweaks from Alfred Manderson’s initial flight FTL travel soon became common place, from there we began looting our galaxy.
There are a vast number of mining colonies and semi-permanent enclaves off-world, but total offworld population is around only 1 billion. These colonies are often corporate locations, deep-asteroid mining camps or research stations. A few are swanky resort retreats, like the artificial beaches of Gamma Serpentis and the wineries of Epsilon Aurigae. The bulk of space travelers are workers though, as corporate profits have ruled the day for some time now.