Jarmusto
Overview
6k, Crest Island - Ikalyx Expanded 2k -> 6k · 1.20.2, survival friendly, Download, Java & Bedrock, Minecraft World, Community Suggestion
Welcome to Jarmusto, a amazing 36km² custom Minecraft map created by McMeddon. This world is the expandsion of Ikalyx. Surrounding it with a huge crest island and a gigantic mountain half ring. Featuring dozens of islands, badlands, volcanos and more. Embark on thrilling adventures by plundering forests and balloons, battling through deserts, or constructing your dream home on cliffs or mountains. Discover custom thriving diverse island to explore. Enjoy your adventure!
Size
Footprint
6,145 × 6,145
blocks, 37.8 km² at one block per metre
Edge to edge
- Happy ghast 28 min
- On foot 24 min
- Minecart 13 min
- Horse 11 min
- Elytra 3 min
Walking, a minecart on powered rails, an average horse and rocket-boosted elytra.
Sizes in the library 84% smaller than this
Most worlds are 4K (87 of them). The largest is MCS SMP Season 3 Server Map #S3 at 9K.
Biome composition
Shares are measured across the built map. Past its edge the world keeps generating normal vanilla Minecraft chunks, so biomes missing from this list can still be found out there.
Land 58.5% of map
-
Plains 31.2% -
Beach 14.3% -
Stony Peaks 6.6% -
Badlands 6.5% -
Snowy Slopes 5.7% -
Jagged Peaks 5.2% -
Old Growth Pine Taiga 4.9% -
Snowy Plains 4.0% -
Desert 3.9% -
Forest 3.8%
14 more 14.0%
-
Birch Forest 2.8% -
Savanna 1.7% -
Snowy Taiga 1.2% -
Cherry Grove 1.2% -
Jungle 1.1% -
Frozen Peaks 1.0% -
Dark Forest 0.9% -
Flower Forest 0.9% -
Taiga 0.8% -
Sparse Jungle 0.7% -
Meadow 0.6% -
Mushroom Fields 0.6% -
Swamp 0.3% -
Mangrove Swamp 0.1%
Water 41.1% of map
-
Ocean 38.4% -
Lukewarm Ocean 16.9% -
Deep Ocean 15.4% -
Cold Ocean 10.5% -
River 8.9% -
Warm Ocean 6.3% -
Frozen Ocean 3.2% -
Frozen River 0.4%
Caves
What this world's caves are made of, by volume, measured from the save in 4 block cells.
- Normal Caves 72.9%
-
Lush Caves 21.4% -
Dripstone Caves 5.0% - Magma Caves 0.4%
-
Deep Dark 0.3%
Inferred. These have no biome of their own in Minecraft, so they are named from the blocks around the cave rather than read from the save.
Structure coverage
Counted inside the built map. Past its edge the world keeps generating normal vanilla Minecraft chunks, so structures not confirmed here can still generate out there.
Surface 2/7 confirmed
- Desert pyramids Not checked
- Igloos Not checked
- Jungle pyramids Included
- Pillager outposts Not checked
- Swamp huts Not checked
- Trail ruins Included
- Woodland mansions Not checked
Underground 5/6 confirmed
- Amethyst geodes Included
- Ancient cities Included
- Dungeons / monster rooms Included
- Mineshafts Included
- Strongholds Included
- Trial chambers Missing
Ocean 4/4 confirmed
- Buried treasure Included
- Ocean monuments Included
- Ocean ruins Included
- Shipwrecks Included
Portal structures 1/1 confirmed
- Ruined portals Included
Settlements 1/1 confirmed
- Villages Included
Loot tables
Which of the game's loot tables can turn up on this map, read from the world's own files. Confirmed means the scan found the table itself; not observed means the structure carrying it was not seen in this export.
Counted inside the built map. Past its edge the world keeps generating normal vanilla Minecraft chunks, so tables not seen here can still turn up out there.
Chest loot 15/20 confirmed
- Abandoned mineshaft Included
- Buried treasure chest Included
- Desert pyramid Included
- End City treasure Not observed
- Igloo chest Not observed
- Jungle temple Included
- Jungle temple dispenser Not observed
- Nether fortress bridge Not observed
- Pillager outpost Not observed
- Shipwreck map Included
- Shipwreck supply Included
- Shipwreck treasure Included
- Simple dungeon Included
- Spawn bonus chest Included
- Stronghold corridor Included
- Stronghold crossing Included
- Stronghold library Included
- Underwater ruin (big) Included
- Underwater ruin (small) Included
- Woodland mansion Included
Village chest loot 14/15 confirmed
- Village armorer Included
- Village butcher Not observed
- Village cartographer Included
- Village desert house Included
- Village fisher Included
- Village fletcher Included
- Village mason Included
- Village plains house Included
- Village savanna house Included
- Village snowy house Included
- Village taiga house Included
- Village tannery Included
- Village temple Included
- Village toolsmith Included
- Village weaponsmith Included
Archaeology 1/1 confirmed
- Archaeology loot Included
Structure loot 0/1 confirmed
- Trial chamber loot Not observed
What is new in Jarmusto
- reduced hight of rolling hills
WorldPainter source files for Jarmusto
Jarmusto is published twice: the finished world you drop into your saves folder, and the project source files it was built from. Depending on the world that means the WorldPainter project, with the terrain, the biomes and the structures still on separate layers, or the black and white height and colour maps behind it, or both.
- Switch the structure layers off and export a clean terrain-only version.
- Re-export at a different Minecraft version instead of waiting for an updated build.
- Reshape the terrain, move a biome or fix something yourself, on the original layers.
- Use the terrain as the base for your own map, on your own server or project.
Opening them needs WorldPainter, which is free. See the FAQ for the terrain-only case in full.
These files are for you, not for passing on
The project source files are licensed to you personally, and they are the one part of a world that is not under Creative Commons. Everything above is yours to do. What is not:
- Share, pass on or publish the project source files
- Sell the source files, or sell a world exported from them
- Redistribute a world exported from them, modified or not
What’s included in Jarmusto?
See what this Minecraft world contains. Results combine MCA Selector findings, chunk data, level.dat, and manually placed structure pins.
Beta edition: some results are still being verified.
- Seed
- Unknown
- World type
- Unknown
DETAILED INVENTORY Explore the world contents
Search and filter the registries found in this world.
Open the inventory Close the inventory
Explore the world contents
Search and filter the registries found in this world.
Biomes
Biome types found in the existing Overworld.
Structures
StructuresSurface and underground structure types evidenced by existing starts or reviewed markers.
Loot types
Loot typesLoot families evidenced by existing loot-table references.
Animals
AnimalsAnimal types observed in the existing world.
Blocks
BlocksReference inventory only. Missing crafted or dimension-specific IDs are not automatically survival failures.
Cave biomes
Available cave biomes found in the existing Overworld.
Key compatibility details
The most relevant survival features, grouped by category.
No features match these filters.
This report inventories existing save data without loading, generating, or changing chunks. Vanilla terrain may still generate beyond the existing map boundary.
Inspect the world data
The world settings Minecraft stores in level.dat, as captured when this world was scanned. Read only, and player data is never published.
No fields match that search.
Questions about Jarmusto
- What is Jarmusto?
-
Jarmusto is a hand-made survival world of 6,145 × 6,145 blocks, made with WorldPainter, World Machine, Gaea, Axiom and WorldEdit, built for Minecraft Java 1.20.2. You download the world folder and play it like any other save, in singleplayer or on your own server.
- How big is Jarmusto?
-
6,145 × 6,145 blocks, so about 38 million blocks of surface. Walking from one edge to the other takes roughly 24 minutes at normal walking speed. The terrain runs from Y -64 to Y 320.
Outside that area the world keeps generating normal vanilla Minecraft chunks, so you never hit a wall, you just leave the built part behind.
- Which Minecraft version does Jarmusto need?
-
Jarmusto is built for Minecraft Java 1.20.2. Newer releases normally open it fine. Opening it in an older release is not supported: blocks and structures added after that version cannot load, and the world can be damaged by the attempt.
Bedrock players need a converted copy. See the Bedrock notes in the FAQ.
- Which biomes are in Jarmusto?
-
35 in total. The land is mostly Plains (31.2%), Beach (14.3%), Stony Peaks (6.6%) and Badlands (6.5%), counted as shares of the land rather than of the whole map.
Water covers 41.1% of the map, and land 58.5%.
By volume this world's caves are Normal Caves (72.9%), Lush Caves (21.4%) and Dripstone Caves (5.0%). The cave breakdown has the rest.
The full breakdown is further up this page, with every biome and its share.
- Which structures are in Jarmusto?
-
13 of the 19 structure types the scan checks are confirmed present: surface (2/7), underground (5/6), ocean (4/4), portal structures (1/1) and settlements (1/1).
Not confirmed: Desert pyramids (not checked), Igloos (not checked), Pillager outposts (not checked), Swamp huts (not checked), Woodland mansions (not checked) and Trial chambers (missing). "Searched, not found" means the scan looked and came up empty; "not checked" means it has not been looked for yet.
The structure list above names every one of them.
- Is Jarmusto ready to play in survival?
-
Yes. A scan of the world file confirms loot tables, structures, animals and ores, so the survival loop runs from the first night: chests hold the game's real loot tables, mobs spawn as they do anywhere else, and you can mine, farm and build without adding anything. It plays in vanilla Minecraft, with no mods, no datapacks and no creative mode.
The world contents report at the bottom of this page holds the item-by-item detail.
- Where do I download Jarmusto?
-
From the download link on Patreon, also on the button at the top of this page.
Also available: the source files on Patreon and the PlanetMinecraft project page, which carries the release notes and the known issues for this particular build.
- What is new in Jarmusto?
-
Every world is built on the one before it, and Jarmusto brought 1 logged change into the line: new terrain, new assets and fixes to the generators that made it.
From its list:
- reduced hight of rolling hills
The full list is on this page. These are the world's own additions, not patches released after it, so an older download is not missing them.
- Can I look at Jarmusto before downloading it?
-
Yes. Open it in the 3D explorer and fly the real terrain in your browser, with the biomes, the caves and the marked structures. Nothing to install.
How do I install Jarmusto on Java Edition?
- Unpack the archive you downloaded from Patreon.
- Open your saves folder. On Windows press
Win+Rand enter%appdata%\.minecraft\saves. On macOS it is~/Library/Application Support/minecraft/saves, on Linux~/.minecraft/saves. - Move the unpacked folder in. It must be the folder that contains
level.dat, not a folder wrapping it. - Restart Minecraft on 1.20.2 or newer and pick the world in singleplayer.
Can I play it on Bedrock, or on a server?
Bedrock needs a converted .mcworld copy, and converted worlds carry their own
quirks around spawn, chests and villagers.
For a server, drop the world folder in as the server's world and start it.
What may I do with it?
The worlds are released under CC BY-NC 4.0. The Rights panel on this page lists what that allows and how to credit it.