They just added New Dimensions to Minecraft (1.16 Snapshot Update 20w21a)

Here's a look at the NEW custom dimensions added to Minecraft 1.16. You can now add your own custom worlds and dimensions! This is awesome!PLAY Block Ness Mo

Nether Update – Minecraft Wiki

Java Edition 22w18a – Minecraft Wiki

Minecraft 1.16 Update

How to get Everything You'll Ever Need In a Minecraft Dimension

Java Edition 1.19 – Minecraft Wiki

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Java Edition 1.20.5/Development versions – Minecraft Wiki

Unbreak my Nether - Minecraft 1.16 Pre-release 2 is now out! : r

SOUL SPEED Enchantment! Big Redstone Changes Soon

Closing in - Minecraft 1.16 Pre-release 3 is out! : r/Minecraft