Sponge

A sponge is a block that can be placed to remove water in an area around itself. This turns it into a wet sponge, which can be smelted or placed in the Nether to dry it to be reused. Sponges can only be found in ocean monuments.

Either type of sponge can be mined by hand, or with any tool, dropping itself as an item; however, hoes break sponges the fastest compared to other tools.

Ocean monuments can have "sponge rooms". Each room contains an average of 30 wet sponges. See Ocean Monument/Structure for details.