Updated for Java Edition 26.3 (October 2026).
The warm ocean is the shallow, turquoise ocean of hot regions, and the only biome where coral reefs and sea pickles generate. It usually lines desert coasts. In our sample of 300 Java 26.3 seeds it covered 2.1% of the surface and the nearest one was a median 2,361 blocks from spawn, so it is rarer than the lukewarm ocean.
| Dimension | Overworld |
|---|---|
| Where it generates | Shallow coastal water in hot regions, mostly along desert coasts |
| How common | 2.1% of the surface in our sample (about 1 block in 50) |
| Distance from spawn | Median 2,361 blocks; within 1,000 blocks in 14% of seeds, within 2,000 in 38%, within 5,000 in 90% (our sample) |
| Mobs | Tropical fish, pufferfish, squid, dolphins, nautiluses, drowned; glow squid in underground water |
| Notable blocks | Coral blocks, coral and coral fans in five colors, sea pickles, seagrass, sand. No kelp. |
| Structures | Warm ocean ruins, shipwrecks, ruined portals; underground, mineshafts and trial chambers |
| Biome ID | minecraft:warm_ocean |
| Added in | Java Edition 1.13 (Update Aquatic, 2018) |
How to find a warm ocean
Find a desert and follow it to the sea. In our sample, more than half of the warm ocean’s edge (53%) touched desert directly, with no beach in between. The rest bordered lukewarm ocean (15%), stony shore (12%), river (9%) and deep lukewarm ocean (8%). If you are already at sea, water that turns a brighter turquoise and a sandy floor dotted with color mean you’ve crossed in.
These three Java 26.3 seeds put warm ocean within about 200 blocks of spawn. Each coordinate is inside the biome, checked at block level.
| Seed | Warm ocean at | From spawn | Map |
|---|---|---|---|
-4695015855228395307 |
X 14, Z 186 | 66 blocks | Open on the map |
3658299122873172360 |
X -46, Z -26 | 205 blocks | Open on the map |
-6825279759677013491 |
X 290, Z 290 | 127 blocks | Open on the map |
In a world you already have, /locate biome minecraft:warm_ocean finds the nearest one (cheats on), or paste your seed into the biome finder. These are Java seeds; Bedrock worlds from the same number are different.
Warm ocean vs lukewarm ocean
They are two separate biomes, and the lukewarm ocean has no coral at all. Here is how they compare in Java 26.3:
| Feature | Warm ocean | Lukewarm ocean |
|---|---|---|
| Coral reefs and sea pickles | Yes | No |
| Kelp | No | Yes |
| Fish | Tropical fish, pufferfish | Cod, tropical fish, pufferfish |
| Deep version | None | Deep lukewarm ocean |
| Warm ocean ruins | Yes | Yes |
| How common (our sample) | 2.1% of the surface | 4.6% of the surface |
| Median distance from spawn (our sample) | 2,361 blocks | 970 blocks |
So in our sample the lukewarm ocean was more than twice as common and usually much closer to spawn. If you only need sandstone ruins or tropical fish, the lukewarm ocean is the easier trip. For coral, it has to be warm ocean.
Is there a deep warm ocean?
No. Java 26.3 has no deep warm ocean biome. Where warm water gets deep, the game uses the deep lukewarm ocean instead, which is why ocean monuments, which need a deep ocean, never generate in warm ocean itself.
Coral reefs
Reefs are made of coral blocks topped with coral and coral fans in five types: tube, brain, bubble, fire and horn. To collect them, bring a Silk Touch pickaxe. Without it, coral and fans drop nothing and a coral block drops as a dead coral block. Coral also dies and turns gray if it is placed out of water.
Sea pickles grow on the reefs in clusters of up to four, and a bigger cluster gives off more light underwater. The warm ocean is also the only biome where bone meal used on the sea floor grows new coral along with the seagrass, so you can grow a reef of your own here.
Mobs
Schools of tropical fish and pufferfish fill the reefs; cod don’t spawn here. Squid, dolphins and drowned spawn as in other oceans. Since Java 1.21.11, so does the nautilus, a neutral sea mob you can tame with pufferfish and ride. Its undead form, the zombie nautilus, spawns carrying a drowned with a trident, and in warm oceans it comes as the coral variant, which appears nowhere else.
Warm ocean ruins and the Warm Ocean Ruins Map
The ruins here are built from sandstone instead of the stone bricks of cold ocean ruins, and they generate in warm, lukewarm and deep lukewarm oceans. Many are partly buried in sand, so swim low and look for sandstone walls poking out of the floor. Bring a brush for the suspicious sand inside.
Since Java 26.3 there is a Warm Ocean Ruins Map, an explorer map that can turn up in abandoned camp loot and marks the nearest warm ocean ruins.
What changed in 2025-26
In Wilderness Bound (Java 26.3, September 2026), the new Warm Ocean Ruins Map was added to abandoned camp loot.
In Mounts of Mayhem (Java 1.21.11, December 2025), the nautilus started spawning in all oceans, warm ocean included, and the zombie nautilus spawns here in its coral variant.
In Spring to Life (Java 1.21.5, March 2025), the warm ocean counts as a warm biome for the new farm animal variants, so a pig, cow or chicken spawned here (with a spawn egg, for example) comes out as the warm variant. They don’t spawn here naturally.
Source: the official 26.3, 1.21.11 and 1.21.5 release notes.
How we measured
The numbers on this page come from our own seed map engine, running Java Edition 26.3 world generation. We generated 300 random seeds and sampled every 16th block across a 10,240 by 10,240 block square centered on each world’s spawn. “How common” is the biome’s share of those samples; “distance from spawn” is how far the nearest sample of the biome was. The warm ocean showed up inside that square in 285 of the 300 seeds. The seeds above were picked from the same run, and each coordinate was re-checked at block level.
