How does one would create multi-biomes landscape like Fortnite? (only talking about the landscape materials. Not the trees, stones and such)

Example
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I’m making a game where I would like to have different biomes (snow, desert, boreal forest, grassland, etc).

But I have no idea where to start, and I haven’t found a single tutorial that shows how to do something like that.

Would each biomes have their own set auto-material (like slope material, rocky/stone texture)?

Easiest way: Don’t use landscape.
And you can have near infinite biohmes.

When landscape pieces are just sculpted meshes you can paint whatever you want on it.

If you insist on using landscapes, then you have to design a master material with 3 paint layers.
In which you can change textures via instancing.

You then create different material instances for different biomes and you assing different materials to different landscape tiles.

When you paint, or create a splat map, you have the same 3 layer names. For instance
Dirt, grass, rock.
But on different level tiles they assume different looks, so dirt could look like grass or sand or dirt…

Realistically. Its a waste of anyone’s time. Just use meshes.