Warm Ocean biome — Minecraft

Overview

Warm ocean is the only biome in Minecraft where coral generates, and that single fact makes it worth a long swim. Coral reefs grow on the sand floor in all five colours — tube, brain, bubble, fire and horn — as coral blocks, coral fans and coral plants, and the blocks are among the brightest solid colours available for building. Coral is also fragile in a way most blocks are not: take it out of water and it dies within seconds, turning grey and permanently becoming dead coral, so every block has to be mined with Silk Touch or moved in water. Sea pickles grow on the coral and give light underwater, and bone meal on a coral block spreads them. Tropical fish spawn in far greater variety here than anywhere else, pufferfish are common, and dolphins are plentiful. The most useful quirk of the biome is what does not spawn: drowned do not generate in warm ocean at all, which makes it the one stretch of water you can dive at night without being surrounded. It is too shallow for ocean monuments. Warm ocean borders lukewarm ocean and beaches beside deserts and jungles.

Coral blocks and fans for the brightest building colours in the game, sea pickles for underwater light, tropical fish for dyes and axolotls, pufferfish for Water Breathing, and sand in quantity.

Warm Ocean sits in the temperate band of Minecraft's biome table, generating in the Overworld at a base temperature of 0.5.

Weather reaches Warm Ocean: it rains during storms, so crops grow and cauldrons fill on their own.

2 generated structures can appear here, among them Ocean Ruins and Shipwreck.

3 mobs name Warm Ocean specifically among their spawn biomes: Dolphin, Pufferfish, and Tropical Fish.

Ocean biomes vary by temperature: warm oceans carry coral and tropical fish, cold and frozen ones do not. Every ocean can hold a shipwreck, a ruin or buried treasure, and the deep variants are where ocean monuments generate.

How to get it

Warm ocean generates off hot coastlines, usually next to desert, jungle or badlands. Coral reefs are visible from the surface as bright colour against pale sand, typically within 200 blocks of the shore.

Tips

Mine coral with a Silk Touch pickaxe or it drops nothing; without water around it, live coral dies in seconds.
Waterlog coral blocks in your build or they will turn grey — a single air block adjacent is enough to kill them.
4 sea pickles in one block give light level 15, which is the only fully underwater light source that needs no redstone.
Drowned never spawn in warm ocean, so this is the safest water in the game to build in at night.

Climate and generation

Warm Ocean has a base temperature of 0.5, which puts it in the temperate band. Temperature is not a thermometer reading — it is the single number that decides snow versus rain, whether water freezes over, and what colour the grass renders.

Above 0.15 water stays liquid and any precipitation falls as rain.

Property	Value	What it changes
Temperature	0.5	Decides whether rain falls as snow, whether water freezes, and the grass and foliage tint.
Precipitation	Yes	Cauldrons fill on their own and farmland stays hydrated during a storm.
Dimension	Overworld	Sets which mobs, structures and ores can generate at all.
Grass and water tint	#7BA4FF	The colour the game applies to grass, leaves and water in this biome.

Properties

Grass and water tint: #7BA4FF
Structures generating here: 2

Mobs in Warm Ocean

Dolphin, Pufferfish, and Tropical Fish name Warm Ocean specifically as a spawn biome, so this is where you go to find them.

On top of those, the mobs that spawn in open terrain anywhere in the Overworld can appear here too, given the right light level. Mobs that only come from a structure or a spawner — breezes from trial chambers, blazes from fortresses, evokers from mansions — are deliberately not in this list.

Also spawns throughout Overworld

Structures found here

2 structures can generate in Warm Ocean: Ocean Ruins and Shipwreck.

Ocean Ruins — Scattered clusters of sunken buildings, in a sandstone warm-water variant and a stone cold-water variant.
Shipwreck — A wrecked sailing ship, generated upright, capsized, or broken in two, on the sea floor or beached on the sand.

Guides and tools that cover this

Frequently asked questions

Where do I find Warm Ocean?

Warm Ocean generates in the Overworld. A locate command finds the nearest one instantly; without cheats, exploring in one direction and watching the F3 screen's biome line is the reliable method.

What spawns in Warm Ocean?

Dolphin, Pufferfish, and Tropical Fish spawn here specifically, and the usual Overworld mobs can appear given the right light level.

Does it rain in Warm Ocean?

Yes — as rain. Cauldrons fill on their own during a storm and farmland stays hydrated.