I am making/placing portals in the nether every 125 blocks so I have a checkpoint of portals every 1000 blocks in the overworld.

The Y axis of my portal are is at 120, like in the screenshot below.Picture of my portal in the nether

Now, when I entered that portal, it spawned me inside of the cave. (the screenshot shows no portal on it since I removed it, but the obsidian is the original location of the spawned portal) Spawn area of the exit portal

I decided to dig straight up and try to look for a reason why I spawned in the cave and I'm just seeing an area that is perfectly fine for a portal to spawn in.

The surface above the portal I spawned in

My question is why did the game decided to spawn a portal in a cave? Are there some checks that the game does? All I know is if it has a space for it, it goes there.

If it matters, the game version I'm running on is 1.14.4.


Nether portals prefer generating on the same height as in the other dimension. So if you create your portal below y=64 in the Nether, it is likely to be generated in a cave in the Overworld.

The closest valid position in 3D distance is always picked.

Minecraft wiki (archive)

  • But my entry portal is at Y120, the exit portal location doesn't make sense at all of that's the case.
    – Convert
    Sep 14 '19 at 15:34
  • Oh yes, you even wrote that in the question. Then I don't know. This might be a bug. Sep 14 '19 at 15:37
  • The wiki (the one you linked, thank you) says the game looks for a 3x4 space to make a valid spawn. Both the cave and the top satisfy this. Maybe the game just lazily checked the area and probably this is a bug. Thank you for your answer, regardless.
    – Convert
    Sep 14 '19 at 15:42
  • It's a bit more complicated, but a 1×4 area of completely flat ground with nothing on it definitely is a valid portal spawn location. Sep 14 '19 at 16:28

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