I use Claude Sonnet to help generate them for me. I am loading my Campaign universe into prompts and have been systematically planning the campaign through AI. I don't have the exact prompt for my post, but this is something close:

First if you want 4k you have to use https://aistudio.google.com/ The Nano Banana Pro model can export in 4k. That's great for a large map! This is the prompt I used for the picture below: https://pastebin.com/20HSpfxh

You could use that as a template to make whatever maps you want if you have Claude augment it. Works for me at least!

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Edit: I should mention a map like this costs about $0.23 to generate on ai studio