seedlookoutOVERWORLD · OCEAN
Ocean Monument
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Large prismarine buildings guarded by guardians and three elder guardians. Players raid them for sponges, gold, Tide armor trims, and decorative blocks, or build guardian farms there.
This guide follows vanilla Java 26.3. Historical changes retain their own edition and version. Bedrock generation and loot can differ. Screenshots and verified seeds below retain their own game versions.
28462718234064871 · Java 26.3 · overworldReference capture · Naturally generated structure, photographed in Minecraft Java 26.3.Game data and source research
Where it generates in Java 26.3
Eligible starts are Deep Ocean, Deep Cold Ocean, Deep Lukewarm Ocean and Deep Frozen Ocean. Warm Ocean is not in this starting-biome tag. [2][5]
Candidate positions and rarity
Java 26.3 selects one potential starting chunk per 32×32-chunk region (512 blocks on each side). Candidate selection happens before successful structure generation; this is not a measured density or an average travel distance. [3][4]
At chunk-local X=9 and Z=9, the generator samples surrounding biomes at sea level with radius 29. Every sampled biome must belong to the required surrounding tag, which resolves to oceans and rivers. This broader test is separate from the deep-ocean start requirement. [1][3][4][5]
What the starting position means
Monument placement uses triangular candidate spread in 32×32-chunk regions. The generator creates a monument only after the surrounding-biome and start checks; the spacing is not the distance between monuments you will actually encounter. [1][4][5]
A maze inside a fixed outer landmark
A monument combines its large prismarine exterior with a connected arrangement of interior rooms. The room fitter can join adjacent cells horizontally or vertically, so an interior from another monument is not a complete route map for this one. [7]
| Part | What to look for |
|---|---|
| Central core | The treasure core encloses a 2 × 2 × 2 group of gold blocks. [7] |
| Wing rooms | The two side wings each receive an elder guardian. [7] |
| Upper room | The penthouse receives the third elder guardian. [7] |
| Sponge rooms | Optional sponge-bearing room pieces; their number is not fixed for every monument. [7] |
Three elder placements and renewable guardians
The piece construction places three elder guardians, while the monument natural-spawn override lists ordinary guardians. These are different sources: killing the elders does not disable later eligible guardian spawns. [6][7]
An elder guardian periodically applies Mining Fatigue III to nearby players. Its code checks every 1,200 ticks and applies a 6,000-tick effect within 50 blocks when the effect helper accepts the player. Allow for slower mining while planning a route; clearing a passage through the walls is not the same as removing the effect source. [7]
Loot and rewards in Java 26.3
The monument reward path inspected here is elder-guardian entity loot. Tide trim and wet sponges are separate drops with different conditions. The temple does not assign a treasure-chest table to these rewards. [8][10]
The Tide trim pool has one draw with empty weight 4 and template weight 1. That pool has no killed_by_player condition and no Looting modifier. The wet-sponge pool does require killed_by_player and then supplies one wet sponge. [8]
Gold blocks in the central treasure and sponge blocks in a generated sponge room are placed blocks. Collecting those blocks follows block-breaking rules rather than the elder-guardian table or a per-chest roll; a particular layout must still be checked. [8][10]
| Item | Where the rule applies | What the data establishes |
|---|---|---|
 Tide armor trim smithing template | One elder-guardian entity-loot invocation | 20.0% chance; one template. This pool is independent of the player-credit and Looting conditions on other pools. [8][9] |
 Wet sponge | Elder-guardian drop after killed_by_player passes | One wet sponge from its separate, player-credit-gated pool. [8] |
Version history and release dates
These milestones retain their edition and exact build labels. Snapshot, beta and preview dates belong to those development builds; full releases and staggered Pocket platform releases are dated separately. Historical introduction claims come from the cited Wiki history. [11]
| Version | Released | What changed |
|---|---|---|
| Java 1.8 | September 2, 2014 | Introduced ocean monuments in snapshot 14w25a. [11][13] |
| Java 1.8.2 | February 19, 2015 | Corrected monument generation in customized worlds. [11][14] |
| Java 1.9 | February 29, 2016 | Expanded the deep-ocean area required around a monument's center. [11][15] |
| Pocket 0.16.0 | October 21, 2016 – October 25, 2016 | Added monuments to Pocket Edition, the predecessor of Bedrock Edition. [11][16] |
| Java 1.11 | November 14, 2016 | Added ocean explorer maps that direct players to monuments. [11][17] |
| Pocket 1.1.0 | June 1, 2017 | Added ocean explorer maps to Pocket Edition. [11][18] |
| Bedrock 1.4.0 | May 16, 2018 | Allowed monuments in deep frozen, deep lukewarm, and deep cold oceans. [11][19] |
| Java 1.13 | July 18, 2018 | Stopped monuments from generating retroactively in existing chunks. [11][20] |
Checked in game by SeedLookout
Screenshots
28462718234064871 · Java 26.3 · overworldReference capture · Naturally generated structure, photographed in Minecraft Java 26.3.
28462718234064871 · Java 26.3 · overworldReference capture · Naturally generated structure, photographed in Minecraft Java 26.3.
-5222399596891977076 · Java 26.3
41006135150685160 · Java 26.3
9141707267233856 · Java 26.3Our screenshots of naturally generated structures in Minecraft. Each caption gives the seed, coordinates and version. Select one to open it at full size.
Seeds with this ocean monument
We found each ocean monument at these coordinates in the seed's Java version. Other versions and Bedrock may generate a different world.
Show 4 more seedsShow fewer seeds12 of 16
| Seed | Version | Variant | X, Y, Z |
|---|---|---|---|
Ocean monument among icebergs beside a mushroom shore29091098865339477 | Java 26.3 | Ocean monument | -144, 63, 96 |
Mushroom shore with a submerged monument and copper chambers-963374613974828980 | Java 26.3 | Ocean monument | 192, 63, 160 |
Mushroom shore beside an ocean monument and sunken portal3721475279528813 | Java 26.3 | Ocean monument | 288, 63, -400 |
Mushroom island with a submerged monument to the west876019281330649 | Java 26.3 | Ocean monument | -192, 63, 224 |
Sources
References identify the edition, version and evidence behind the guide. Game code and data describe generation rules; the seed table records locations checked in game. Research reviewed 2026-10-02.
- Mojang Java 26.3: structure configuration ↗
Inner archive META-INF/versions/26.3/server-26.3.jar: data/minecraft/worldgen/structure/monument.json
Evidence details
Official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c. SHA-256 by archive member: data/minecraft/worldgen/structure/monument.json = 4bae1a6d87d63f3a9d9938b51b08d8fd4cacfce2f912ee9f536b318fc5159876
- Mojang Java 26.3: resolved starting-biome tags ↗
Inner archive META-INF/versions/26.3/server-26.3.jar: data/minecraft/tags/worldgen/biome/has_structure/ocean_monument.json; data/minecraft/tags/worldgen/biome/is_deep_ocean.json; data/minecraft/tags/worldgen/biome/is_ocean.json; data/minecraft/tags/worldgen/biome/is_river.json; data/minecraft/tags/worldgen/biome/required_ocean_monument_surrounding.json
Evidence details
Official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c. SHA-256 by archive member: data/minecraft/tags/worldgen/biome/has_structure/ocean_monument.json = 2f89f50897401c694c72084eb40c5e11ac5a71602ee7f094d3d6c497b8bf201a; data/minecraft/tags/worldgen/biome/is_deep_ocean.json = 5c8de7b8025f2a7f93887aeeca0a5af1bf67f58004031742e082a16302c7a783; data/minecraft/tags/worldgen/biome/is_ocean.json = e86dbd183dbfc27044b1e9bfd9892f1098284cbf45e28d3218c9e45fcbd1a895; data/minecraft/tags/worldgen/biome/is_river.json = e710cc66051a66f2383bfd1d40a95c9c58334127792d5db832ecaf233627e054; data/minecraft/tags/worldgen/biome/required_ocean_monument_surrounding.json = 785594a1fb5e19625a980e5291db5eb0fbd68a5e2bdf57bcd5acfe57e227b9a8
- Mojang Java 26.3: candidate placement settings ↗
Inner archive META-INF/versions/26.3/server-26.3.jar: data/minecraft/worldgen/structure_set/ocean_monuments.json
Evidence details
Official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c. SHA-256 by archive member: data/minecraft/worldgen/structure_set/ocean_monuments.json = a1ffa9fab20a38163788da41da9c7bd1f59c527e27acc7985a2b930c2388fa2b
- Mojang Java 26.3: candidate filtering and weighted retries ↗
Inner archive META-INF/versions/26.3/server-26.3.jar: net/minecraft/world/level/chunk/ChunkGenerator.class; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement$ExclusionZone.class; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement$FrequencyReducer.class; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement$FrequencyReductionMethod.class; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement.class; net/minecraft/world/level/levelgen/structure/placement/RandomSpreadStructurePlacement.class. Methods: RandomSpreadStructurePlacement.getPotentialStructureChunk; AbstractSpreadingStructurePlacement.isStructureChunk; ChunkGenerator.createStructures / tryGenerateStructure
Evidence details
Official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c. Implementation inspected using CFR 0.152; reconstructed Java is not an original Mojang source publication. SHA-256 by archive member: net/minecraft/world/level/chunk/ChunkGenerator.class = 7e5145ec6e36cbc7af979e869d4947c85e4715b8d13105f1369f0a385c40851d; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement$ExclusionZone.class = eb0d49eb1ffb0714fbdb04abde954fbdbd50cfeafd411f593de8159a06488300; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement$FrequencyReducer.class = e2887ebf5f8937ca3b038d6e1c40bc1c77f983a97b5b7ed9bdcd78b59d103e82; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement$FrequencyReductionMethod.class = 3664480026b9e91c8235bdbf6d98fdbbb78586f8d0decee70f9ea788d3291a71; net/minecraft/world/level/levelgen/structure/placement/AbstractSpreadingStructurePlacement.class = 0775a5cd47242fafd7f9977a9cfb821a6fffe5d1defcbc3bf8cded7e2427a4a8; net/minecraft/world/level/levelgen/structure/placement/RandomSpreadStructurePlacement.class = 8fbeed7711f96285b9b39b2e8363ffaa6ea80dd03baea4c1e6fa98e90b7f8eb9
- Mojang Java 26.3: generation entry points ↗
Inner archive META-INF/versions/26.3/server-26.3.jar: net/minecraft/world/level/levelgen/structure/Structure$GenerationContext.class; net/minecraft/world/level/levelgen/structure/Structure$GenerationStub.class; net/minecraft/world/level/levelgen/structure/Structure$StructureSettings$Builder.class; net/minecraft/world/level/levelgen/structure/Structure$StructureSettings.class; net/minecraft/world/level/levelgen/structure/Structure.class; net/minecraft/world/level/levelgen/structure/structures/OceanMonumentStructure.class. Methods: OceanMonumentStructure.findGenerationPoint; Structure.findValidGenerationPoint; Structure.GenerationContext.isValidBiome
Evidence details
Official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c. Implementation inspected using CFR 0.152; reconstructed Java is not an original Mojang source publication. SHA-256 by archive member: net/minecraft/world/level/levelgen/structure/Structure$GenerationContext.class = 0c4335baa022b0482299b5cc0a3d0492fd3160542640b2538a5b8934822cc12b; net/minecraft/world/level/levelgen/structure/Structure$GenerationStub.class = e7a25f7418cfbfafaa6ecc1558a4bacde160ab247be6997df4aef3288da76a52; net/minecraft/world/level/levelgen/structure/Structure$StructureSettings$Builder.class = e9b9a37f14f156749ceb686ab31f34954c3b65c0e9f1ff43cdebb508a72b1261; net/minecraft/world/level/levelgen/structure/Structure$StructureSettings.class = 5796d330ef7ea491ee64b34ccdfe6c08a62b71886441bd87cd327a2fc6188f80; net/minecraft/world/level/levelgen/structure/Structure.class = fa023ce735376b7042242948275a0869a7e22d30e5e4c5c6502b521578577188; net/minecraft/world/level/levelgen/structure/structures/OceanMonumentStructure.class = 3fc4ba63b0e8adc6e1e0b9de89654e2016fd16994079fab971f21f148d26ea7e
- Mojang Java 26.3: ocean monument templates and data ↗
data/minecraft/worldgen/structure/monument.json
Evidence details
Official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c; inner META-INF/versions/26.3/server-26.3.jar SHA-256 a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6. NBT dimensions are unrotated saved template bounds (X × Y × Z), including air and connectors, not usable interior dimensions.
- Mojang Java 26.3: ocean monument layout and encounter implementation ↗
net.minecraft.world.level.levelgen.structure.structures.OceanMonumentPieces; net.minecraft.world.entity.monster.ElderGuardian; OceanMonumentPieces.MonumentBuilding.generateRoomGraph, OceanMonumentCoreRoom.postProcess, OceanMonumentWingRoom.postProcess, OceanMonumentPenthouse.postProcess, OceanMonumentSimpleTopRoom.postProcess; ElderGuardian.customServerAiStep; data/minecraft/worldgen/structure/monument.json.
Evidence details
Official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c; inner META-INF/versions/26.3/server-26.3.jar SHA-256 a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6. Official bytecode inspected through CFR 0.152; reconstructed implementation, not an original source checkout.
- Mojang Java 26.3: ocean monument loot data ↗
Inner META-INF/versions/26.3/server-26.3.jar: data/minecraft/loot_table/entities/elder_guardian.json
Evidence details
Verified official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c. File SHA-256s: elder_guardian.json: 55c1474220818da4d31881aaac9e7a9b960db3ad576a9de375a2902829312599. Table identity and conditional item rules are distinct from any particular generated container.
- Java 26.3 ocean monument: calculated selection odds ↗
Relevant /pools indices in the data reference; LootPool.addRandomItem/addRandomItems; UniformContainerBase.uniformFields; UniformGenerator.getIntUnsafe.
Evidence details
For direct unconditional weighted pools, chance of at least one selection is 1 minus the average of (1−weight/totalWeight)^n over inclusive uniform integer rolls. Values are theoretical table-invocation probabilities, not seed frequencies. Exact inputs: [{"itemId":"minecraft:tide_armor_trim_smithing_template","table":"data/minecraft/loot_table/entities/elder_guardian.json","pool":4,"fraction":"1/5","chance":0.2,"weight":1,"total":5,"rolls":[1]}]
- Mojang Java 26.3: ocean monument layout and encounter implementation ↗
net.minecraft.world.level.levelgen.structure.structures.OceanMonumentPieces; net.minecraft.world.entity.monster.ElderGuardian; OceanMonumentPieces.MonumentBuilding.generateRoomGraph, OceanMonumentCoreRoom.postProcess, OceanMonumentWingRoom.postProcess, OceanMonumentPenthouse.postProcess, OceanMonumentSimpleTopRoom.postProcess; ElderGuardian.customServerAiStep; data/minecraft/worldgen/structure/monument.json.
Evidence details
Official server SHA-1 33680f5f2ac32864d6d7cf5e56a705fdb3e05f4c; inner META-INF/versions/26.3/server-26.3.jar SHA-256 a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6. Official bytecode inspected through CFR 0.152; reconstructed implementation, not an original source checkout.
- Minecraft Wiki: Ocean Monument — pinned history ↗
History section, retaining edition, release grouping, development-version and experimental-toggle qualifiers.
Evidence details
Pinned article revision 3788764 from 2026-09-22T13:35:40Z. Historical claims only; not an audited game build or release-date source.
- Minecraft Wiki: Ocean Monument description ↗
Opening description and History
Evidence details
Pinned article revision 3788764; retrieved October 1, 2026. Article history supports historical introductions; current generation and loot are audited separately from game data.
- Java 1.8: release date ↗
/id; /releaseTime
Evidence details
Release metadata establishes its date, not feature introduction. Original Wiki history must support introduction separately.
- Java 1.8.2: release date ↗
/id; /releaseTime
Evidence details
Date belongs to the exact 1.8.2 build. Snapshot and prerelease dates are separate from the later full release; metadata does not prove the feature introduction.
- Java 1.9: release date ↗
/id; /releaseTime
Evidence details
Release metadata establishes its date, not feature introduction. Original Wiki history must support introduction separately.
- Pocket 0.16.0: release date ↗
Version infobox release date
Evidence details
Platform releases were staggered: Android, Fire OS, Windows Phone, Windows 10, Gear VR – October 21, 2016; iOS – October 25, 2016. These dates describe full Pocket releases, separately from earlier betas.
- Java 1.11: release date ↗
/releaseTime
Evidence details
Release metadata establishes its date, not feature introduction. Original Wiki history must support introduction separately.
- Pocket 1.1.0: release date ↗
Published 6/1/17; opening paragraph says the 1.1 update for Pocket and Windows 10 is out today; full 1.1 changelog > Woodland Mansions
Evidence details
Historical date from the pinned Minecraft Wiki version article; introduction is separately attributed to each structure article history.
- Bedrock 1.4.0: release date ↗
Version infobox release date
Evidence details
Platform releases were staggered: May 16, 2018<ref name=OutNow>{{Mcnet|update-aquatic-phase-one-out-now|Update Aquatic Phase One is out now!|May 16, 2018|Tom Stone}}</ref>. These dates describe full Pocket releases, separately from earlier betas.
- Java 1.13: release date ↗
/id; /releaseTime
Evidence details
Release metadata establishes its date, not feature introduction. Original Wiki history must support introduction separately.
Item art uses vanilla Java 26.3 assets from the official client release. Icons retain their game version alongside the guide.
Descriptions adapted from the Minecraft Wiki retain its attribution under CC BY-NC-SA 3.0. Calculations and code analysis are SeedLookout research. Screenshot captions identify each capture. The seed table contains our published verified seeds; checking a location does not establish particular room contents or chest loot.