How to Find an Ocean Monument in Minecraft Bedrock

Ocean monuments are the underwater fortresses of Minecraft: giant prismarine temples glowing with sea lanterns, guarded by laser-firing guardians and three massive elder guardians. They're the only place to get sponges, the best source of prismarine and sea lanterns, and they hide 8 blocks of gold in a sealed treasure room. They're also one of the toughest structures to raid, especially on Bedrock where the usual "drink milk" trick doesn't work. Here's how to find one and clear it properly.

Where Ocean Monuments Generate

Ocean monuments only spawn in deep ocean biomes and their variants (deep ocean, deep cold ocean, deep frozen ocean, deep lukewarm ocean). They will not generate in regular shallow oceans or near coastlines.

A few key facts:

• Only one monument generates per 512×512 block area, so they're spread far apart
• They sit on the ocean floor and always generate at the same Y level on Bedrock
• The structure is huge: 58×58 blocks at the base, with a central section and two wings
• They're lit by sea lanterns, which makes them easier to spot at night as a soft glow underwater

Method 1: Ocean Explorer Map (No Cheats)

The most reliable survival method is to buy a map from a cartographer villager.

1. Find or create a cartographer villager (place a cartography table near an unemployed villager)
2. Trade with them to level them up to Journeyman
3. At Journeyman level, they may offer an Ocean Explorer Map for emeralds and a compass
4. The map marks the nearest monument with a distinctive icon
5. Follow the map, sailing across the ocean until you reach the marked location

This points you to the nearest monument with an exact location. It costs some emeralds and villager leveling, but it's the go-to method for a pure survival playthrough.

Method 2: /locate Command (Fastest)

If cheats are enabled:

/locate structure monument

This returns the coordinates of the nearest ocean monument instantly. Teleport or sail there. As always, enabling cheats disables achievements for that world.

Method 3: Just Sail and Look

Monuments are large and glow, so you can find them by exploring deep oceans. Watch for these signs:

• Dark shapes underwater — the massive prismarine structure is visible below the surface from a boat
• Guardian laser beams — the yellow-green beams are visible even from above the water
• Sea lantern glow — at night, the monument gives off a soft light you can spot from a distance
• Sudden Mining Fatigue — if you get this debuff out of nowhere while swimming, an elder guardian is nearby and you've found a monument

Sailing at night in deep ocean biomes is the most efficient way to spot one without a map, thanks to the sea lantern glow.

The Bedrock Milk Problem (Read This Before You Go)

This is the single most important thing to know about raiding a monument on Bedrock, and most Java-focused guides get it wrong.

Elder guardians inflict Mining Fatigue III on every player within 50 blocks. This debuff makes breaking blocks roughly 370 times slower, essentially freezing you out of mining the monument.

On Java Edition, elder guardians only re-apply the debuff every 60 seconds, so you can drink milk to clear it and get about 55 seconds of normal mining. On Bedrock, this doesn't work. Elder guardians re-inflict Mining Fatigue immediately after you drink milk. There's no 60-second window. Milk is effectively useless for mining until all three elder guardians are dead.

What this means for your strategy: you must kill all three elder guardians first before you can mine anything. There's no shortcut, no milk-chugging workaround. Kill the elders, then the Mining Fatigue stops, then you loot.

What to Bring

Water Breathing potions (8:00), at least 3. Absolutely critical. You can't fight and breathe at the same time without these. Brew with pufferfish + awkward potion, extend with redstone.

Night Vision potions (8:00), at least 3. The monument interior is dark. You need to see the guardians and navigate the maze of rooms.

Diamond or netherite armor, Protection IV. Guardian lasers deal magic damage that armor helps reduce.

Respiration III helmet. Extends underwater breathing as a backup to your potions.

Depth Strider III boots. Lets you move at near-normal speed underwater. Without this, you're a slow target for guardian lasers.

Aqua Affinity helmet. Mine at normal speed underwater (relevant only after the elders are dead).

A trident with Impaling V. Impaling adds huge bonus damage to aquatic mobs, making it the best weapon against guardians and elder guardians. A bow or crossbow also works well since melee triggers guardian thorns damage.

Blocks that break instantly. Slime blocks, honey blocks, TNT, decorated pots, or resin blocks. These are breakable even under Mining Fatigue, so you can use them to build cover or passages during the fight.

Milk buckets (a few). Not for mining, but useful for clearing Mining Fatigue after all three elders are dead so you can loot faster.

How to Raid the Monument

1. Kill the three elder guardians first. This is your top priority. One is in the top central room, and one is in each of the two wings. They don't respawn, so once they're dead, they're gone for good.
2. Use pillars for cover. Guardian and elder guardian lasers can't pass through solid blocks. Swim behind the monument's prismarine pillars to break line of sight, then pop out to attack.
3. Watch the thorns. When a guardian or elder guardian extends its spikes, hitting it with melee deals damage back to you. Time your melee hits for when the spikes are retracted, or use ranged attacks and a trident instead.
4. Keep moving. Standing still makes you an easy laser target. Depth Strider helps you stay mobile.
5. Once all three elders are dead, the Mining Fatigue stops. Now you can drink milk if any lingering effect remains, and start mining and looting.

Finding the Elder Guardians

Every monument's interior layout is randomly generated, so there's no fixed map. But the three elder guardians are always in predictable general areas:

• Top center: the highest room in the central section. Often the hardest to reach; if you hit a dead end, look up, there's usually a vertical passage.
• Left wing: a large room with a central pillar. From the entrance, this is roughly to your left.
• Right wing: a large open room with a square platform. Roughly to your right from the entrance.

A helpful navigation tip: when heading into a wing, you'll usually need to turn the same direction twice to reach the elder guardian room.

The Loot

Ocean monuments don't have loot chests, but the materials are unique and valuable:

8 gold blocks (72 gold ingots' worth) in the treasure chamber at the center, encased in dark prismarine. You can only mine these after the elders are dead.

Sponges. The only source in the game. Each elder guardian drops one wet sponge on death (3 guaranteed), and many monuments have sponge rooms with 30+ wet sponges on the ceiling. Dry them in a furnace to make them reusable water-absorbing tools.

Prismarine and sea lanterns. The monument is built entirely from prismarine variants and sea lanterns, both of which are hard to get anywhere else. Mine them for underwater builds. Use Silk Touch to collect sea lanterns whole.

Tide Armor Trim. Elder guardians can drop this exclusive smithing template. It's the only source, so grab it if you get one.

Draining the Monument (Optional)

Once the elders are dead, some players drain the entire monument to turn it into a dry base or a guardian farm. The tool for this is sponges.

A dry sponge absorbs water in a 7×7×7 area when placed. Place it, let it soak up the water, then pick it up (now wet), dry it in a furnace or on netherrack in the Nether, and reuse it. With the sponges you get from the monument itself, you can slowly drain the whole structure. It's tedious but turns the monument into an incredible underwater base or the foundation for a guardian farm that produces prismarine, sea lanterns, and XP passively.

Common Mistakes

Trying to mine before killing the elders. On Bedrock, Mining Fatigue is permanent until all three elder guardians are dead. Don't waste time trying to milk your way through it. Kill the elders first.

Fighting guardians with a sword. Their thorns deal damage back when their spikes are out. Use a trident with Impaling, a bow, or a crossbow instead.

Running out of Water Breathing. The monument is a maze and clearing it takes time. Bring extended (8:00) potions and several of them.

Ignoring the wet sponges. Many players see the yellow-green blocks on sponge room ceilings and don't recognize them. Those are wet sponges, one of the most useful items in the game. Grab every single one.

Getting lost. The interior is a genuine maze. Place instant-break blocks (slime, honey) as markers so you can track where you've been, since you can't break prismarine to make your own path until the fatigue is gone.

Wrapping Up

Find a monument with an ocean explorer map, /locate, or by sailing deep oceans at night and watching for the sea lantern glow. Then remember the golden rule of Bedrock monument raids: kill all three elder guardians before you try to mine anything, because milk won't save you. Bring Water Breathing, Night Vision, Depth Strider, and an Impaling trident, and you'll walk away with gold, sponges, prismarine, and the materials for one of the most impressive underwater bases in the game.

Planning to breathe easy down there? Check our guide on breathing underwater in Bedrock for every method, including the conduit that makes underwater exploration effortless.