Curseforge Link

Regions Unexplored is one of our two main terrain and biome generators. Along with Terralith, Regions Unexplored offers an amazing diversity of biomes both above and below ground. If you are a builder, you're going to love the possibilities this mod opens up to you!

Unfortunately, because we use Better End (hence the BetterX type world), Regions Unexplored does not currently affect generation in the Nether. They are working on a fix for this

Here's a sneak peak of what the pack might include in the future!