Make sure you have already installed Minecraft Forge and Open Terrain Generator Mod.
NODUS FOR MINECRAFT 1.11.2 FOR MAC HOW TO
Open Terrain Generator Mod How to install: Wetland Forest: Covered in cliffs, rivers and lakes and lush with unique foliage with the occasional mountain surrounded in roofed forest. Tundra: Mostly flat, snowy and treeless with patches of coniferous forest and mountains. Tropical Savanna: A hot savanna broken up with clay coated canyons, high plateaus and unique rock formations. Sandstone Mesa: A vibrant sandstone and clay combination with baobab trees and surface stalagmites. Mangrove Forest: Murky green waters are home to tall Mangrove trees, lily pads and small volcanoes.
High Cliffs: A picturesque but difficult to traverse combination of cliffs, valleys, roofed forests and high peaks.