https://wccftech.com/witcher-3-4k-terrain-mod-skellige/

A brand-new The Witcher 3 4K terrain mod has been released, which replaces all original Skellige terrain textures with HQ 4K textures.

Created by modder ‘Boostin4kix’, the modder responsible for the White Orchard 4k Terrain mod, the mod is “lore friendly” and doesn’t add anything that shouldn’t be there. “This texture mod is somewhat lore friendly and doesn’t add things like snow where they don’t belong”, he writes. “I basically just tried to improve upon what was already there, so nothing should appear out of place.”