This is the full playable area of the Cyberpunk 2077 map. It's made up of the city, with six districts, as well as the Badlands and outlying areas. The blue lines are roads which gives a good idea ...

You need to choose your Cyberpunk 2077 lifepath shortly after booting ... Playing as a Nomad starts you out in the Badlands, having just recently left your Nomad clan to go it alone.