How to delete terrain

@Aeventy’s method is complex and tedious. Why not just use the built-in terrain editor?

Use Search & Replace, located within the editor itself (Under “Edit”), to select the terrain you want to remove. Then, replace all the terrain with air. So much more simpler.

I imagine you’re currently using the Region tool- that tool is not useful as the area it can select is tiny (512 x 512 x 512). Search & Replace however can go up to 16384 x 16384 x 16384, which is the maximum terrain can be generated at.

Regarding the method mentioned above:

Parts, at maximum size, can go to 2048 x 2048- this means you will have to use many, many parts and is really inefficient. The Search & Replace tool, however, is far larger- saving you both effort and time.

Caves do not affect the existence of the Bedrock layer.

I hope this helps you!

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