This workflow helps generating stylised fantasy world maps based on height maps (or other types of maps such as faction maps) from map generation tools such as  https://azgaar.github.io/Fantasy-Map-Generator/ .

The image-to-image component can be toggled on or off for higher (or lower) adherence to the original style and composition.

Changing the style option in the prompt input node can help produce the map in different art styles.

The tiled diffusion node can be switched off if you have very large VRAM.

You may experiment with different controlnet settings in both the first and second ksampler. E.g. changing the depth controlnet to canny may be better for generating 2D maps.