What sponge is in Minecraft
Sponge is the only block in Minecraft that can soak up water. It comes in two forms: dry sponge, which is the yellow block you place to drain an area, and wet sponge, which is the brown, dripping block you get after it has done its job. A dry sponge placed next to water absorbs every source block around it in a single tick, turns into a wet sponge, and then has to be dried before you can use it again.
The only place sponge spawns naturally is the ocean monument. That makes it one of the few truly limited resources in the game, and it is also why a single good monument trip can stock you with thirty or more sponges if you find the sponge room.
Where to find sponge
Wet sponge generates in two spots inside an ocean monument: scattered across a few of the upper side rooms in small clumps, and in much larger numbers inside the sponge room.
The sponge room is a tall chamber buried in the monument with wet sponges plastered across the walls and ceiling. Not every monument has one, and the ones that do hide it behind prismarine walls and a layer of elder guardians. If a monument has a sponge room, you can usually expect between 30 and 60 wet sponges from that single chamber.
Elder guardians also drop one wet sponge each when killed. Every monument has three elder guardians, so even a sponge-roomless monument is worth at least three wet sponges if you fight your way through the bosses. The drop is guaranteed, not random.
There is no other source. You will not find sponges in chests, caves, villages, shipwrecks, ruins, or any other structure. If you need a stockpile, ocean monuments are the destination.
How to dry a wet sponge
A fresh wet sponge is heavy and useless until it dries out. There are two ways to dry one.
In a furnace
Put the wet sponge in the input slot and any fuel in the fuel slot. After about ten seconds the sponge turns into a dry sponge. If you put an empty bucket in the slot above the fuel slot, the water that comes out of the sponge fills the bucket instead of vanishing. A stack of 64 wet sponges and 64 empty buckets gives you a full chest of dry sponges plus 64 water buckets, with no wasted output.
In the Nether
Place a wet sponge anywhere in the Nether and it dries instantly into a dry sponge with a small puff of steam. The water it loses just evaporates. No fuel, no waiting, no buckets needed. The Nether method is faster but you have to be in the Nether; the furnace method is slower but you stay home and you get the water back.
How sponge absorbs water
Place a dry sponge next to water and it absorbs every source block within a 7x7x7 cube centered on the sponge, up to a maximum of 65 source blocks. The sponge instantly turns into a wet sponge, the water disappears, and the area dries out.
A few things to know about how absorption works:
- The sponge has to actually touch water. Place it on the surface, against a wall, or under a flooded ceiling. If there is air or any other block between the sponge and the water, nothing happens.
- Absorption only removes source blocks. Flowing water that loses its source does not vanish right away; it keeps flowing for a tick or two before drying up.
- Sponges only soak up water, not lava. Lava has no sponge equivalent.
- The 7x7x7 area is a bounding box, not a flood-fill. Sponges do not chain to absorb water beyond that cube even if there is more water just outside it.
- One sponge handles up to 65 source blocks. A 7x7x7 cube has 343 positions, so a single sponge in deep water hits the 65-block cap and stops.
For draining a large area, place sponges in a grid with about six blocks between each one. Pick them up with any tool, dry them, and place them again. A full monument drain usually takes 30 to 50 dry sponges, which is exactly why the sponge room is the prize of any monument trip.
Drops and mining
Both dry sponge and wet sponge drop themselves when broken with any tool, including your bare hand. They are soft blocks, so the fastest mining tool is a hoe. Silk Touch is not required; sponges always drop their block form.
Wet sponge has the same hardness as dry sponge (0.6), so the only practical difference when mining is in transport. A wet sponge does not drip water onto neighboring blocks despite the dripping particle effect, but if you mistake one for a dry sponge and place it in your build, it sits there as a brown blob until you mine it out again. Keep wet and dry sponges in separate stacks in your hotbar so you do not mix them up under pressure.
Tips and common mistakes
A few practical things worth knowing before you take a stack of dry sponges to a build:
- Use a hoe to mine sponge. Do not chew up your sword on a soft block.
- Pre-dry before you leave. Drying sponges at home in a furnace is cheaper than building a Nether portal at the build site. Decide based on which is closer.
- Stack them. Both dry and wet sponges stack to 64. Bring a full hotbar before a big drain job.
- One sponge, big area. For shallow water (one to three blocks deep), a single dry sponge can clear a 7×7 square in one shot. Place, wait, mine, move one row over.
- Watch the edges. Place a sponge near the edge of a body of water and you will often leave a thin strip of water along the outside of the 7×7 cube. Walk along the edge with another sponge to mop it up.
- Reuse. The wet/dry cycle never wears out. Sponges do not degrade with use.
- Don’t place wet sponge by mistake. A wet sponge does not flood anything around it, but it also will not absorb water, so it is dead weight in your hotbar. Sort before you start.
Java vs. Bedrock differences
Sponges behave the same way in Java and Bedrock for everything that matters: the same two block forms, the same monument loot, the same furnace and Nether drying, and the same 7x7x7 absorption area capped at 65 source blocks.
The small differences worth knowing:
- Bedrock is slightly stricter about source blocks at the edges. Flowing water near the boundary of the cube sometimes lingers a moment longer before drying up. The end result is the same in both editions.
- The water-bucket-in-furnace trick works in both editions. In Bedrock, double-check that the empty bucket is in the slot above the fuel and that the wet sponge is in the input slot.
- Both editions let sponges remove water from waterlogged blocks within the absorption area. The block stays; only the water is gone.
Frequently asked questions
Can you craft a sponge in Minecraft?
No. There is no crafting recipe for sponges. You have to find them in ocean monuments or kill elder guardians for them.
What is the fastest way to mine sponge?
A hoe. Sponges count as a hoe-mineable material, so a hoe breaks them faster than any other tool. Mining time is short either way because sponges are soft.
How many sponges are in a sponge room?
It varies, but most sponge rooms hold between 30 and 60 wet sponges arranged on the walls and ceiling. Not every monument has a sponge room, and the ones that do are well worth the search.
Does Silk Touch matter for mining sponge?
No. Sponges drop themselves with any tool, so Silk Touch makes no difference when you are mining them.
Can you dry sponges in the Overworld without a furnace?
Not directly. The only one-shot drying method is to place the wet sponge in the Nether. In the Overworld, you have to use a furnace.
Does sponge work on lava?
No. Sponge only absorbs water. There is no block in the game that absorbs lava the way sponge absorbs water.
Will sponges absorb water from waterlogged blocks?
Yes. Sponges remove water from waterlogged stairs, slabs, fences, and similar blocks inside the absorption area. The block stays in place; only the water is removed. This works the same in Java and Bedrock.
The short version
If you have never raided an ocean monument, the sponge room is reason enough to learn how. A single good trip can stock you for every drain job you will ever do, and the wet/dry cycle means you never run out as long as you have a furnace and some fuel. Mine with a hoe, keep a bucket in the furnace to catch the water, and use the Nether for one-step drying when you are in a hurry.