A rough doodle of Thera's home location

Earth is a post-apocalypse in this story, but a recovered one. Everyone is thriving now, humans survived, but things have changed. Humans don't live in cities anymore, as they become "afraid of heights", plus all the damage being impossible to navigate through. So city ruins have been overtaken by other things, mostly things that fly or climb (and sometimes swim)

Thera and her kin live in an old city surrounded by ocean, so it's more isolated than most places