My first instinct was that it is the
spoiler
Walensee with Amden at the left and Weesen bottom left. But if I remember correctly, the Walensee doesn’t have a bend like that, so that can’t be it. Also there would have to be a visible Autobahn along the right side of the lake, which there clearly isn’t.
Have you heard of The Longing? It doesn’t tick all your boxes but it is definitely a long term game that has you make slow, real-time progress while the real time clock of 400 days is ticking down. Not really management sim progress though.
On the more managy side, I’ve had some fun with Factory Idle. Essentially mini-Factorio as an idle game.