Skylands over the Sea

Skylands over the Sea

Datapack that creates sky island worlds floating over an endless ocean.

by
25.3K Downloads
datapackfabricforgeneoforgequiltadventureworldgen
Rent Server with this Mod

Screenshots

Cherry Grove and Village
Hot Biomes
Mushroom Fields
Swamp and Dark Forest

About this Mod

Skylands over the Seas

This is a datapack that changes the overworld generation to be floating islands, with a twist! All of the ocean biomes are generated below you. All caves and underground biomes are generated under the ocean.

IMPORTANT:

Versions below 3.0.0 of the datapack/mod alter the dimension height. This was added at first to add more breathing room for building on the islands, but I have since removed it in 3.0.0+, as this will corrupt worlds when the mod is removed. 3.0.0 does not have this issue. If you are migrating a 2.X.X pack to 1.21.9+, please use version 2.0.4, but note that it will not be supported for future versions. I apologize for any inconvenience.

Also checkout

  • Angel Islands a mod that changes the normal overworld to include Aetherial Islands when in deep ocean biomes!
  • Aetherial Islands: Clusters Edit an add-on that creates zones where islands will and won't generate, creating large gaps between island clusters (works for Skylands over the Seas as well!).
  • Diabolical Islands a mod that brings the Aetherial Island generation to the Nether!

Compatibility: Does this work with insert mod name here?

If that mod changes the terrain, one of the mods will probably overwrite the other. If that mod adds biomes, it should be compatible, but if you have issues with bodies of water not generating, use the optional dependency, Lithostitched. This is just because of the tricky technique I had to use to make this, along with Minecraft's weirdness with surface builders. Some issues may need specific compatibility packs made, which I may make in the future.

Available Versions

[MOD 1.20-1.21.10] Skylands over the Sea 3.0.2release
MC 1.20, 1.20.1, 23w31a, 23w32a, 23w33a, 23w35a, 1.20.2-pre1, 1.20.2, 23w40a, 23w41a, 23w42a, 23w43a, 23w43b, 23w44a, 23w45a, 23w46a, 1.20.3-pre1, 1.20.3-pre2, 1.20.3-pre3, 1.20.3-pre4, 1.20.3, 1.20.4, 23w51a, 23w51b, 24w03a, 24w03b, 24w04a, 24w05a, 24w05b, 24w06a, 24w07a, 24w09a, 24w10a, 24w11a, 24w12a, 24w13a, 24w14a, 1.20.5-pre1, 1.20.5-pre2, 1.20.5-pre3, 1.20.5-pre4, 1.20.5-rc1, 1.20.5-rc2, 1.20.5-rc3, 1.20.5, 1.20.6, 24w18a, 24w19a, 24w19b, 24w20a, 24w21a, 24w21b, 1.21-pre1, 1.21-pre2, 1.21-pre3, 1.21-pre4, 1.21-rc1, 1.21, 1.21.1, 24w33a, 24w34a, 24w35a, 24w36a, 24w37a, 24w38a, 24w39a, 24w40a, 1.21.2-pre1, 1.21.2-pre2, 1.21.2, 1.21.3, 24w44a, 24w45a, 24w46a, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10fabric, forge, neoforge, quilt
May 1, 2026
[DP 1.20-1.21.10] Skylands over the Sea 3.0.2release
MC 1.20, 1.20.1, 23w31a, 23w32a, 23w33a, 23w35a, 1.20.2-pre1, 1.20.2, 23w40a, 23w41a, 23w42a, 23w43a, 23w43b, 23w44a, 23w45a, 23w46a, 1.20.3-pre1, 1.20.3-pre2, 1.20.3-pre3, 1.20.3-pre4, 1.20.3, 1.20.4, 23w51a, 23w51b, 24w03a, 24w03b, 24w04a, 24w05a, 24w05b, 24w06a, 24w07a, 24w09a, 24w10a, 24w11a, 24w12a, 24w13a, 24w14a, 1.20.5-pre1, 1.20.5-pre2, 1.20.5-pre3, 1.20.5-pre4, 1.20.5-rc1, 1.20.5-rc2, 1.20.5-rc3, 1.20.5, 1.20.6, 24w18a, 24w19a, 24w19b, 24w20a, 24w21a, 24w21b, 1.21-pre1, 1.21-pre2, 1.21-pre3, 1.21-pre4, 1.21-rc1, 1.21, 1.21.1, 24w33a, 24w34a, 24w35a, 24w36a, 24w37a, 24w38a, 24w39a, 24w40a, 1.21.2-pre1, 1.21.2-pre2, 1.21.2, 1.21.3, 24w44a, 24w45a, 24w46a, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10datapack
May 1, 2026
[MOD 1.20-1.21.10] Skylands Over The Sea 3.0.1release
MC 1.20, 1.20.1, 1.20.2, 1.20.3, 1.20.4, 1.20.5, 1.20.6, 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10fabric, forge, neoforge, quilt
October 25, 2025
[DP 1.20-1.21.10] Skylands Over The Sea 3.0.1release
MC 1.20, 1.20.1, 1.20.2, 1.20.3, 1.20.4, 1.20.5, 1.20.6, 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10datapack
October 25, 2025
[MOD 1.20-1.21.10] Skylands Over The Sea 3.0.0release
MC 1.20, 1.20.1, 1.20.2, 1.20.3, 1.20.4, 1.20.5, 1.20.6, 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10fabric, forge, neoforge, quilt
October 17, 2025

How to Install Skylands over the Sea on Your Server

1

Order Server

Order a Minecraft Java server with at least 4 GB RAM (6 GB recommended).

2

Set datapack Loader

In the panel under "Egg", select the datapack loader and matching Minecraft version (1.21.10).

3

Install Mod

Open the mod browser in the dashboard and search for "Skylands over the Sea". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

datapackfabricforgeneoforgequilt

Minecraft Versions

1.21.10, 1.21.9, 1.21.8 (+84 more)

Server-side

Required

Recommended RAM

6 GB(min. 4 GB)

Frequently Asked Questions

Skylands over the Sea server crashes on startup – what to do?

Most common cause: wrong datapack version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 4 GB RAM is allocated and the loader matches the mod version (1.21.10). You can switch loaders with one click in the panel.

Is Skylands over the Sea compatible with datapack and fabric and forge and neoforge and quilt?

Skylands over the Sea officially supports datapack, fabric, forge, neoforge, quilt for Minecraft 1.21.10, 1.21.9, 1.21.8. Note: Forge and Fabric mods are NOT cross-compatible – pick one loader and stick with it. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Skylands over the Sea – how to optimize performance?

Recommended RAM: 6 GB (per 5 players). Use /spark profiler to check if Skylands over the Sea consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install Skylands over the Sea with just one click on your server.

Recommended RAM
6 GBab €12/mo
Min. 4 GB | +1 GB pro 5 Spieler
Create Server Now
1-Click Mod Install
NVMe SSD Storage
DDoS Protection included

Details

License
MIT License
Server-side
Required

Supported Versions

1.21.101.21.91.21.81.21.71.21.61.21.51.21.424w46a24w45a24w44a+77 more