Antique Atlas 4 Sky Islands Compat
by ediiited
Antique Atlas 4 Sky Islands Compat lets the Antique Atlas 4 map draw floating islands in sky-island worlds, and it is a client-side NeoForge addon for 1.21.1.
What it does
Clouds island outlines in sky-island worlds are drawn on the atlas, so islands that float above the ground keep visible edges instead of turning into blank squares. Sparse clouds mark the empty space between islands, which lets a player read the layout of a floating world on the map.
Floating islands use ground-level biome art rather than the peak and hill tiles that Antique Atlas 4 would otherwise pick. The addon applies only in dimensions with a low sea level, so ordinary worlds are left untouched. Antique Atlas 4 3.1.2 or newer, Surveyor Map Framework, Forgified Fabric API and Sinytra Connector are required, and the addon is released under the MIT License but is not open source.
Key features
Island outlines
Floating islands are drawn with visible edges on the atlas, so their shapes stay readable on the map.
Sparse cloud markers
Empty space between islands is marked with sparse clouds, showing where the land stops.
Ground-level biome tiles
Floating islands take ground-level biome art instead of peak or hill tiles, matching the terrain players walk on.
Sea level filter
The addon only applies to dimensions with a sea level below 32, leaving other worlds unchanged.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 4
Optional 1
Use cases
Sky-island maps
Players exploring a world of floating islands can follow the layout on the atlas without blank squares at the island edges.
Who it’s for: Players who use Antique Atlas 4 in sky-island worlds on NeoForge 1.21.1, where the default tiles leave islands unreadable.
How it compares
AA4 Atlas is the base atlas mod with a GNU Lesser General Public License v3.0 or later, open source and published for Fabric, Forge, NeoForge and Quilt across 1.20.1 – 1.21.1, with client and server both running it. Surveystones is open source under the GNU Lesser General Public License v3.0 only, covers 1.19.2 – 1.21.1 on the same four loaders and also needs client and server. This addon differs by being client-side only on NeoForge 1.21.1 and not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Antique Atlas 4 Sky Islands Compat | NeoForge | 1.21.1 | Client-side only | 2026-08-19 |
| AA4 Atlas | Fabric, Forge, NeoForge and Quilt | 1.20.1 – 1.21.1 | Client and server | 2025-07-31 |
| Surveystones | Fabric, Forge, NeoForge and Quilt | 1.19.2 – 1.21.1 | Client and server | 2026-02-03 |
Questions
Does Antique Atlas 4 Sky Islands Compat need to be on the server?
Which dependencies must be installed with the addon?
Which game versions does the addon support?
In the catalog
Antique Atlas 4 Sky Islands Compat is one of 19,031 Adventure mods on ModsFinder, and one of 8,588 Adventure mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
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What the author says
A client-side NeoForge addon that makes Antique Atlas 4 usable on sky-island worlds. Antique Atlas 4 is by Sisby folk, building on Hunternif, Kenkron, asie, and tyra314. This addon does not copy AA4's tile art.
Official listing
- Modrinth page
- modrinth.com/mod/aa4-sky-islands
- Owner
- ediiited
- Published
- 2026-08-19
- Updated on Modrinth
- 2026-08-19
- Facts verified
- 2026-10-15