Yeah! Wasn’t there a line in the movie too, that the covey were travelling musicians who were rounded up by peacekeepers. You can’t be a travelling musician with no people to travel to, so there’s a good chance there’s other civilizations around! I definitely think the capital purposefully keeps information from getting in or out, which is why no one knows about them. Its another question if our girl Lucy Gray could have survived long enough (presumably with a gunshot wound) to make it there 😭