This map is inspired, but not directly related, to a Chthonian Highways scenario. I’d say that this map can be used with the scenario, but might require small fixes.
This map by Miska Fredman is created with the support of my awesome patrons and published under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License (CC-NC-BY-4.0).
A high-resolution 300 dpi version with multiple variants of this map is available to my $2+ tier patrons on Patreon.