As reported in #4317, the Unknown, Unknown Land and Unknown Nomad maps have about 10 variations and each copied code to achieve the intended mapgen.
So it contains about 30 duplications of mapgen code with broken indentation, whitespace, sometimes further duplication depending on horizontal/vertical layout.
Instead of fixing small code style mistakes there, it has to be unified in the first place.
Warning: When reading the code, you will go through the following stages of emotions: