I'm not sure. I think it was the previous version of the Bing Image Creator (DALL-E 2, I guess). Also, I use Photoshop to make it usable and seamless, SD for creating maps.
FYI. This is a rare case of a decent AI-work. 95% of it is completely random promt-wise and looks like s... and needs a lot of editing (like A LOT) because of uneven light, and it's not seamless.