Maps of all nine dungeons and the overworld hub, and the flashback sequences..
Carrion: Maps of All Areas
These wonderful maps are created by a gamer named Demajen. If you want to support him, subscribe to his YouTube channel or follow him on Twitter.
BSL-4 Research Ward
Note that you won't be able to explore most of this at the start of the game.
Click to enlarge...
This is the game's "overworld" and it's pretty huge.
Leviathan Reef Base (and Bridge)
Relith Science HQ
Nuclear Power Plant
Armored Warfare Facility
Spoilers - The Derelict
In case you were wondering what the Derelict from the flashback sequences looks like all linked together to give you full overview of what I am assuming is a crashed/abandoned ship.
Note 1: The sky in sequence number 3 changes to night time. I have no way of making that happen on a static image.
Note 2: Yes, I am aware of how bad the sky looks in the desert. Parallax is cool in motion, but not cool for jigsawing together multiple screenshots. Sorry.