Warm Ocean

The only ocean with a reef. Coral blocks, coral fans and sea pickles grow over a sand floor in colours that appear in no other water, and this is the one biome where bone meal will grow coral for you.

Tropical fish swim over it in more variants than anywhere else, pufferfish drift among them, dolphins pass through, and sea pickles light the whole thing from below. Coral dies the moment it is out of water, so carry it in a bucket or with Silk Touch. Ocean ruins and shipwrecks sit on the sand.

Temperature 0.5 with 0.5 humidity is the mild temperate climate of open sea, rainfall above and warm water below. minecraft:warm_ocean is uncommon, arrived with the ocean update in 1.13, and 1.21 still grows the reefs.

The warmest water the Overworld makes. Lukewarm Ocean, Beach and Mushroom Fields border it, so a tropical coast is the sign to follow.

Head for the brightest turquoise water; the colour shift signals coral reefs below.

Uncommon, and worth the sail: coral blocks, coral fans and sea pickles grow in this ocean and in no other. Dolphins lead the way there, and a pufferfish is the price of swimming without looking. Watch the colour: an ordinary blue sea turns bright soon enough as you sail south, and nowhere else does it go that shade. The neighbours above are what it opens out of, and the reef will reveal itself long before you reach the floor.

Four animals and not a hostile among them. Tropical fish lead on 62 percent of a spawn attempt, in shoals of eight, in the thousands of colour patterns that make a bucket and an aquarium worth the trouble. Squid come next on 59 percent, four at a time, dropping ink sacs for a book and quill as well as black dye.

Pufferfish take 38 percent in ones to threes. One inflates and poisons anything that touches it, which is a problem in a reef this crowded, and it is also the brewing ingredient behind Water Breathing, which is why people put up with them.

Dolphins hold the last 12 percent. Feed one raw cod and it leads you to the nearest shipwreck or ruin treasure, and swimming with it grants a speed boost. No drowned is listed for this water at all. The quiet residents are the fish: a tropical fish, for example, comes in thousands of colour patterns and is bucketed for aquariums, while squid drop ink sacs: black dye on one side, books and quill on the other. Per attempt those are the numbers that matter, since nothing here needs watching. A pufferfish drops its own poison problem when fed to nothing, and a dolphin, when fed raw cod, leads you somewhere better. Ink sacs are used for black dye even in water this bright.

Squid

Tropical Fish

Pufferfish

Dolphin

Coral Block, Coral Fan, Coral and Sea Pickle are the part you will actually use, and Sand is what they all sit on. This is the only water in the game that grows a reef, so every colour of coral in your build starts in a sea like this one.

Bring empty slots for coral for decoration and bring silk touch with them, because coral mined without it comes up dead and grey. Sea pickles light up underwater without any redstone, which makes them the cheapest lamp in the game.

The reef and the pickles are two separate plantings on the same floor, which is why you find pickle clusters on bare sand well away from any coral.

The undergrowth laid over the sand follows a pattern that sets this reef apart from every other patch of ground under water, and you break coral with silk touch or you do not break it at all.

A Coral Fan on the reef and a Sea Pickle beside it are the two smallest things this ocean grows and the two easiest to miss.

Coral Block

Coral Fan

Coral

Sea Pickle

Sand

Ruins in a coral reef read differently to ruins on gravel. The sunken stone of ocean ruins generates here as it does across nine biomes counted here, but here it sits among coral blocks and sea pickles, which makes the loot chests and the buried treasure maps inside easier to walk past.

A shipwreck can lie in the same water, one of eleven biomes with one, holding emeralds, supplies and a treasure map in its chests. Neither structure needs deep water, and warm ocean does not have it, so no monument generates in this biome at all.

The sand floor and the reef above it are the rest of what is down there. Mineshaft tunnels lie under the reef with dungeon rooms among them and a rare stronghold below both, placed without regard for which biome ended up on top. The 2 of them are the whole built inventory of the reef: a vessel whose chests hold supplies, and a stone ruin, each offering its own loot and challenges, from generation that reaches 11 biomes for wrecks alone. Exploring the reef offers colour if nothing else, and each of these is able to stay thoroughly well hidden by coral while being worth the swim.

Coral is placed by noise rather than by count, which is why a reef is a patch and not a scatter. Sea pickles land on one chunk in 16, and seagrass gets 80 tries per chunk, the densest rate of any sea. Forty nine passes in total, one more than an ordinary ocean, and the extra one is the reef.

Bone meal grows coral in this water and in no other biome on this site, which turns a single coral block into a reef you planted yourself.

The biome is warm ground for farm animals and frogs, and squid and tropical fish are what spawn here without any help from you. Its water is drawn on a map outline.

The warm ocean gets the warm version of the ocean ruins rather than the cold one, which is the difference between finding a sandstone ruin and a stone one.

Shipwrecks and an ocean portal complete the surface list, and there is no monument in this temperature.