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Ocean monuments, also known as simply monuments, are rare underwater structures found in deep ocean biomes and variants. They are inhabited by guardians and elder guardians. They are the only place where sponges can be found and one of the two places where prismarine can be found; the other being ocean ruins.


Ocean monuments generate in areas with deep ocean biome variants everywhere within a 16 block square radius around the center point, and an aquatic biome (regular/deep/frozen ocean, regular/frozen river) everywhere within a 29 block square radius around the center point. In order to prevent air pockets, water generates around the monument as a part of the structure. It is the largest structure that does not contain a loot chest and the largest water structure. An ocean monument can also overwrite other structures like strongholds during generation.

They can be located with ocean explorer maps, which are bought from cartographer villagers with emeralds.

Ocean monuments may also generate in existing chunks with an InhabitedTime (i.e. the amount of time players have been in the chunk) of less than 3 minutes. They generate in locations that they would have generated in the current version of Minecraft, regardless of what terrain was originally there,[1] meaning they may generate inside large square pools of water surrounded by land, causing the terrain to be harshly cut off.[2]


GuardianFace ElderGuardianFace
Guardian Elder Guardian

The area of the ocean monument spawns only guardians after generating, also being the only location they spawn. Ocean monuments always contain three elder guardians – one at the top and one in each wing.

In Bedrock Edition, ocean monuments always generate at the same Y level, with the top of the roof always being at Y=56. The seafloor surrounding the monument will be cut off should it be higher than the monument's base.


Sponge and treasure

The treasure chamber with a sponge room (smaller dark prismarine room) to its left.

The monument is constructed entirely from variants of prismarine and lit by sea lanterns. It includes a large central section flanked by two wings. Under the monument are 23 giant pillars that stretch to the ocean floor. The main entrance is located at the front of the central section. The base size of the structure is 58×58 blocks. Thus, the ocean monument (the location where guardians and elder guardians spawn) area is 3,364 square blocks.


Certain rooms in the monument contain wet sponges.

The central section consists of various types of chambers. The chambers are randomly generated; each monument has a different number of rooms (at least six) arranged in a unique manner. The chambers connect vertically and horizontally to the different parts of the monument, including the left and right wings. At the topmost room resides an elder guardian. Around the center of the central section lies the treasure chamber, a tall room with eight gold blocks encased in dark prismarine.

Occasionally, monuments contain one or more rooms with approximately 30 wet sponges on the ceiling. Sponge rooms have an opening only in the floor. Not all monuments generate sponge rooms.

One of the wings contains a large room with a small pillar at the center. The room contains a second elder guardian. The other wing consists of a large open space with a large, square-shaped platform, containing another elder guardian. A long hallway that arcs around the wings and the back portion of the monument connects the two wings together.


Icon Achievement In-game description Actual requirements (if different) Gamerscore earned Trophy type (PS4)
PS4 Other
The Deep EndDefeat an Elder Guardian30GSilver
Treasure HunterAcquire a map from a cartographer villager, then enter the revealed structureVisit the structure indicated while the purchased map is in your main hand (hotbar).40GSilver


Java Edition
1.814w25aAdded ocean monuments.[3]
1.8.2pre7Ocean monuments now generate correctly in customized worlds.[4]
1.915w46aOcean monuments now require a larger area of deep ocean at the center to generate.
1.1116w39aAdded ocean explorer maps, which guide players to ocean monuments.
Pocket Edition Alpha
v0.16.0build 1Added ocean monuments.
Pocket Edition
1.1.0alpha ocean explorer maps, which guide players to ocean monuments.
Bedrock Edition
1.4.0beta monuments can now generate in frozen deep oceans, lukewarm deep oceans, and cold deep oceans.
Legacy Console Edition
TU31CU19 1.22 Patch 31.0.1Added ocean monuments.
TU54CU44 1.52 Patch 241.0.4Improved spawn chances of ocean monuments.
New Nintendo 3DS Edition
1.3.12Added ocean monuments.


Issues relating to "Ocean monument", "Water dungeon", or "Water temple" are maintained on the bug tracker. Report issues there.



Development images[]

See also[]


  1. MC-239870 — Large gap around Ocean Monuments if spawned in the area where old and new chunks smooth out
  2. MC-237145 — Ocean monuments can cause nearby terrain to be harshly cut off
  3. "@WTheFranck Sure, but the ocean monument took me over two weeks to make... I need better tools :)"@jeb_ (Jens Bergensten) on X, June 19, 2014
  4. MC-57691, MC-67150