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Is there a way to flood an area without digging a tunnel from the ocean or a pond or another body of water? I don't want to dig it out, I just want to put some water in a hole.

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Classic Minecraft or Minecraft beta? –  Michael K Jun 27 '11 at 14:31
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4 Answers

To learn how to flood a large depression with water, there is a good tutorial on making artificial lakes at Minecraft Wiki.

The basic problem is that a water source block will not create new source blocks all by itself—it will only produce flowing water (which are not blocks), filling your nice lake with crappy cascades and currents. However, two source blocks with air between them will create a new source block where the air was. That means you can fill a deep lake by clever placement of water source blocks, without having to fetch a bucketful of water for every air block in the original hole.

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You can carry water in a Bucket, or you can just spawn some Water Blocks with the give command (if you are a server op) or not playing on single player.

If you are playing single player, using the Bucket will still work, but you could also use an inventory editor to add water blocks to your inventory.

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how to get inventory editor and bucket –  cramscoolio9 Jun 27 '11 at 14:47
    
    
@crams Click the helpful link in the answer. –  SevenSidedDie Jun 27 '11 at 17:54
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The only method that doesn't require an external editor or otherwise is via a bucket of water. This doesn't mean that you have to be stuck going backwards and forwards, slowly filling it up one layer at a time - put a layer of dirt one block below where you want your water to go, and do this over the entire area that you are filling. Building a 2x2 infinite water source nearby is a good idea.

Once you have done that, work around the edges, placing source blocks as you go. After about half way you will notice it filling up more rapidly, until it eventually fills the entire 1 layer deep "lake". Dig all the dirt blocks away and you have yourself a nice deep swimming pool :)

You can see the technique demonstrated in this video. The hole is only a few blocks deep in this case, but it applies to any size.

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but if the area is really big wont that take a really long time? –  ProSay Jul 2 '11 at 12:21
    
Does this create underwater currents? –  Tyr Jul 5 '11 at 5:05
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You could install WorldEdit which also come together with Single-Player-Commands and use the /replace command.

1: Select your selected depression/area.

2: type "/replace Air water"

and the cavity should be filled with water.

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...or just use //fill water <radius> –  Zommuter Jul 2 '11 at 12:16
    
but then the area above the cavity might be also filled. –  ProSay Jul 2 '11 at 12:18
    
no: wiki.sk89q.com/wiki/WorldEdit/Utilities#Filling_pits this command will never ascend above your feet –  Zommuter Jul 2 '11 at 12:59
    
so then you have to put a block just above the top –  ProSay Jul 2 '11 at 13:16
    
no, the top layer of the pool is the height or your feet, but you can use /toggleplace to use pos #1 of your selection instead –  Zommuter Jul 3 '11 at 8:25
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