The Great Wall

The Great Wall is impervious to any damage

The Great Wall is an unbreakable wall located at approximately 440 to 490 tiles away from The Core. It entirely encircles the central Undergrounds, Clay Caves, and The Forgotten Ruins biomes with an undulating border.

The wall cannot be broken with any tools or weapons, only taken down with the help of The Core.

The wall has a mechanical appearance, not to be confused with the more natural looking Obsidian Blocks of various scenes and unreleased biome areas.

Map appearance

The inner biomes and Great Wall cropped from an image of a fully revealed example map:

This was explored in Core Keeper 0.5.1.2, with the help of the Core Keepers Workshop app. It can be explored, in full, as the example map in Map Tool. Note: the angular location of the biomes, terrain generation and scenes are uniquely randomised between different worlds.