Minecraft's oceans are among the most useful spots for building many different survival farms. General mob farms are most efficient when built over oceans since there's no place for mobs to spawn other than the farm, while guardian farms are only possible due to ocean monuments generated at the bottom of the sea. However, building in oceans can be very annoying, thanks to the game's water mechanics.
Flowing water can do undesirable things like break redstone and other placed entities like string, which are needed in some farms. Removing it manually can be annoying, due to the strange ways that source blocks can sometimes behave. Thankfully, the /fill command is capable of removing huge areas of water instantly.
Everything you need to know about using this command to remove large sections of water in Minecraft can be found detailed below.
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How to use Minecraft Java's /fill command to remove water
1) Find water that needs to be removed
The first thing you'll need to do is physically move to wherever the Minecraft water is located. You'll need to get a few different block coordinates, and the easiest way to do that is by physically moving in the block and activating the debug screen.
2) Find coordinates
The fill command requires a starting block and an ending block. The two are then connected and used to make a cubic area. Think of the first block as the bottom front right corner of the cube, and the second coordinate as the top back left corner.
You'll need to open up the debug menu using the F3 Minecraft keyboard shortcut and use the listed coordinates to mark down a starting and ending position.
3) Type out the command
Next, you'll need to type the command into chat. You can do this by either opening chat by using the default hotkey "T" and then typing a forward slash, or by using the "/" hotkey to open chat with a forward slash already typed.
Then, copy and paste, or type out, the Minecraft command listed below, replacing the first set of three asterisks with your first coordinate and the second set with your second coordinate. The command will take the first-named block (in this case, air), and insert it in place of whatever block (in this case, water) comes after the word replace.
- The command: /fill *** *** minecraft:air replace minecraft:water
4) Remove the water
Hitting enter will run the command. The water should vanish instantly, replaced by empty air bordered by a nearly perfectly vertical wall of source blocks. There will be a message in chat detailing how many Minecraft blocks were replaced in total.
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