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You have to fill the space with something, and then mine it away. So imagine if you had a 5x4 pool of water that you wanted to remove. If you filled the water with 20 blocks of material, then mined all of that away, then the space is now empty, the water is gone. Netherrack is a good choice for this since it mines quickly. You should also make sure that new water can't flow in to replace the water you are removing also, block off or dam any other sources.

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13y ago

What else can I help you with?