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

Java Edition 1.17/Development versions – Minecraft Wiki

Et tu, Brute? Snapshot 20w27a is out! : r/Minecraft

Caves & Cliffs – Minecraft Wiki

Minecraft 1.16 Update Mod (snapshot 20w18a Update!) - Modding

Iiiiiiiio

Update on my beta 1.7.3 generation datapack - Added rivers and

Datapack making

Custom Dimension Minecraft Data Pack

Minecraft 1.16 - Nether Update