William Wythers' Overhauled Overworld
I don't know my version or loader

Welcome to William Wythers' Overhauled Overworld for 1.20.1 and higher!

Introduction
This mod attempts to recreate the familiar landscapes you know and love in a way that creates a more realistic and atmospheric world.
WWOO/WWEE difference
We decided to split WWOO in two distinct mods:
- Expanded Ecosphere: This mod includes new biomes and builds upon the old 1.19/1.20 WWOO (bad compatibility with other world-gen mods).
- WWOO: This new project is focused on overhauling the vanilla biomes and is inspired by the style of the old 1.16/1.17 WWOO (good compatibility with other world-gen mods).
Use one or the other! Don't use both. Many features might be doubled and they are NOT intended to be combined.
Key Features
Overhauled Biomes
Every biome has been reworked to provide a more realistic and immersive environment. Say goodbye to the standard biomes and welcome an enhanced world filled with diverse landscapes and exciting adventures.
For an extensive showcase of the (sub)biomes, join our Discord and check out this channel (1.21.5+).
Biome Transitions
Discover the new transitions between biomes, that eliminate jarring shifts between environments, allowing for a more natural world flow. Check out this example picture in the Gallery.
Compatibility with Vanilla Clients
Worried about compatibility issues with your friends? Fear not! Overhauled Overworld exclusively uses vanilla blocks, ensuring that you can install this mod on your server, and your friends can join with their vanilla clients. This makes for a hassle-free and enjoyable multiplayer experience.
Enhance Your Experience
Since WWOO 2.6.0 these are included in the mod and can be enabled via the config!
Navigable Rivers: Improve your river experience with this travel-friendly add-on. Download Here
Cliffs and Coves: Improve your world with better coastlines using this add-on. Download Here
Towering Tepuis: Add a forbidding and mysterious area of adventure to your world. Download Here
If you prefer a datapack over a mod, click here to download the datapack version of WWOO.
Join Our Community
If you have any questions, suggestions, or just want to connect with fellow adventurers, we invite you to join our Discord Server. While there's no Wiki available yet, our friendly community is always ready to assist you on your journey through the Overhauled Overworld.
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21.1, 1.21.11, 1.21.10
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as wwoo-fabric-2.6.7.jar — drop this file into the mods folder
- Download size: 5.5 MB
- Download link checked 27 Aug 2026 — working
These come from our own check of the pack file, not from the source page.