Warning: I have found that the top 1/5th of the map has some issue. The problem is with the AI used to upscale the heightmap. I will have to find an other AI or some other way to upscale the heightmap.
This was created using a heightmap from the game Legend of Zelda: Breath of the wild. Take it and do what you want with it.
This map was made with Worldpainter and is targeted at 1.15-1.16, but it will work with up to 1.18.2
Warning: Since this is created from a heightmap, there is missing parts mostly to cliffs and mountains. Also, the used heightmap was upscaled using an AI, so some smaller details were lost.
Credits:
IfTheG1oveDontFit for the heightmap
Worldpainter to edit the map
waifu2x AI for upscaling the heightmap