Creating landscapes

[DocBuddy]

Greetings!
If this topic is in the wrong section, please move it to the correct place it belongs.
My question is, is there a program/mod to create whole new landscapes?
Since I´m working on a map myself, mods like MapEditor and others just aren´t enough.

[Joopax]

I briefly had a search around, and there is a "map builder" mod? Is this NOT what you're looking for?

EDIT: https://www.gta5-mods.com/tools/map-builder