How to make terrain follow shape of something?

Hello, this is my first time posting on Unity Forums.

I am trying to make terrain, and I need it to look a specific way which I don’t know how to do. I am a beginner in this area and need help. I want the terrain to look like this: (this is a rough box out)

And I have basic terrain:
9787176--1404306--upload_2024-4-22_19-15-58.png

How can I make the terrain follow the shape of the boxes? Any help would be very much appreciated


9787176--1404300--upload_2024-4-22_19-12-59.png

I don’t know what those boxes are supposes to be as far as terrain.

Unity’s terrain system is height-map based, so the terrain must always be a square and each point on the square can be raised and lowered.

is that 2D side view with dungeons? (like Terraria? then could use unity tilemap, sprite shapes or 2d voxel terrains)

or is it 3D terrain with mines/holes? (bit like minecraft?, then look for unity voxel terrain)

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