Skylands over the Sea

Name: Skylands over the Sea
Author: Klinbee

Skylands over the Sea is a world generation mod that places sky islands floating above an endless ocean, and it works through a datapack with no separate content to install.

FabricForgeNeoForgeQuiltServer required, client optionalMIT LicenseOpen source1.18.2 – 1.21.10

What it does

Sky island worlds are generated as floating land masses over an endless sea. The datapack drives the generation, so a world built with it shows islands above the water rather than a standard overworld. The mod is listed under World generation and Adventure, and it also ships as a data pack for server platforms.

Installation requires a loader for the game version in use: Fabric, Forge, NeoForge or Quilt. The server needs the mod, and players may add it on their side. Builds cover 1.18.2 – 1.21.10 with 24 release versions, and the mod is open source under the MIT License. Snapshot builds are published as well.

Key features

Floating sky islands
Islands generate above an endless ocean, giving worlds a sky-based layout instead of standard terrain.
Aetherial Islands
A separate island type can be generated in deep ocean biomes, adding another layer of floating land.
Cluster gaps
A Clusters Edit add-on defines zones where islands will not generate, which produces wide open gaps between island clusters.
Nether island generation
A Diabolical Islands add-on brings Aetherial Island generation to the Nether.

Gallery

Compatibility

Latest build for each game version and loader.

Version

1.21.x11 of 11 versions with builds

1.21.103.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.21.93.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.21.83.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.21.73.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.21.63.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.21.53.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.21.43.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.21.33.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.21.23.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.21.13.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.213.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.20.x7 of 7 versions with builds

1.20.63.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.20.53.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.20.43.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.20.33.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.20.23.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.20.13.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

1.203.0.2+mod3.0.2+mod3.0.2+mod3.0.2+mod

ReleaseBetaAlphaNot available

This mod also publishes snapshot builds. Snapshots are not shown in the matrix.

How it compares

Full comparison

Skylands UpPort is a Fabric, Forge and NeoForge mod for 1.19.2 – 1.21.8 that runs client and server and is not open source. Sky Islands Dimension is a server-side option for Fabric, Forge and Quilt, covering 1.20.1 – 1.21.11, under the MIT License but not open source. Survival Island is server-side only, open source under the GNU Lesser General Public License v3.0 only, and built for Fabric, Forge and NeoForge across 1.19.2 – 1.21.1.

Mod	Loaders	Game versions	Environment	Updated
Skylands over the Sea	Fabric, Forge, NeoForge and Quilt	1.18.2 – 1.21.10	Server required, client optional	2026-05-01
Skylands UpPort	Fabric, Forge and NeoForge	1.19.2 – 1.21.8	Client and server	2025-12-16
Sky Islands Dimension	Fabric, Forge and Quilt	1.20.1 – 1.21.11	Server required, client optional	2026-03-07
Survival Island	Fabric, Forge and NeoForge	1.19.2 – 1.21.1	Server-side only	2025-09-10

Questions

Does Skylands over the Sea need a loader installed on the server?

Yes. The mod is server required, so the server must run it. Clients may add it as well, but they do not have to.

Which loaders does Skylands over the Sea support?

Fabric, Forge, NeoForge and Quilt. Each loader has a file for 1.21.10 dated 2026-05-01.

Can the mod be used on a data pack server?

The mod is also available as a data pack for server platforms, so it can be applied to a world without installing a loader.

In the catalog

Skylands over the Sea is one of 8,515 World generation mods on ModsFinder, and one of 4,027 World generation mods for Fabric. 15,569 mods support Minecraft 1.21.10.