1 Charon: Here we are. Lake Constance.
1 Prof. Jones: What? Aren't you taking us to Geneva?
2 Charon: Now why would I do that?
2 Prof. Jones: Convenience?
3 Charon: I think you mistake me for a taxi driver, not the Ferryman of the Underworld.
4 Prof. Jones: Oh, no, a taxi driver would be much less helpful.

The background is a photo I took myself, in Switzerland, on the real Lake Constance. I was travelling by ferry from Friedrichshafen in Germany to Romanshorn in Switzerland. The church tower you can see in the background (which I've blurred to give the effect of distance in the comic) is a major landmark in the town of Romanshorn.

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2022-07-10 Rerun commentary: That ferry trip across the lake to Switzerland was a spur of the moment thing. My wife and I were staying the night in Friedrichshafen, because I wanted to visit the Zeppelin Museum there. We were thinking about where to go for dinner, and I suggested, "Let's go to Switzerland!"

So we did. We took the ferry across the lake to Romanshorn, had an excellent dinner of rösti with a sort of apricot/custard flan for dessert. And then we went back across the lake to Germany and our hotel for the night.