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If I were to mine netherrack upwards or downwards, left or right in one direction, would I hit bedrock, or would I keep on going? What would happen?

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+1 Good question –  Wipqozn Aug 10 '11 at 19:47

3 Answers 3

up vote 24 down vote accepted

From Minecraft Wiki's page on The Nether:

... Under the Lava ocean, there is a layer of Nettherack1 and Bedrock on the very bottom. Similarly, the very top of the Nether is Bedrock.

1 Or Bloodstone

Basically, going up or down either way leads to Bedrock.

enter image description here

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Out of curiosity, is the bedrock on the top smooth or rough like the bottom in the Overworld? –  Ullallulloo Aug 10 '11 at 20:03
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@Ullallulloo Rough –  fredley Aug 10 '11 at 20:03
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What about left and right? –  alexy13 Aug 10 '11 at 20:22
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@Alexy13 Provided you actually go really far, you will reach the Far Lands. –  SourceTurtle Aug 10 '11 at 21:15
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Really far, as in 32,000,000 (or more) blocks. –  Joe the Person Oct 19 '11 at 22:14

To be technical, neither the Nether nor the surface are infinite (both however are VERY VERY VERY LARGE). Regardless of horizontal limits however, ther vertical limit is 128 blocks, just as the surface is.

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That's not really true. See gaming.stackexchange.com/questions/19179/… –  bwarner Aug 10 '11 at 20:41
    
@bwarner And to that I give you notch.tumblr.com/post/422515389/clearing-up-the-world-size-math –  MGZero Aug 10 '11 at 21:53
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That post is from 2010 and appears to be out of date. The one linked in the questions is from 2011 and references "When I changed the game over from being just single zones of a map to an infinite map" –  bwarner Aug 10 '11 at 22:10
    
@bwarner Ahh, I haven't keeping up with the updates as of late. I have some catching up to do! :) –  MGZero Aug 11 '11 at 12:59
    
@bwarner The map is broken at around 12 million blocks from the centre. For all intents and purposes, that may as well be the end of the map. minecraftwiki.net/wiki/Far_Lands –  Macha Aug 12 '11 at 19:24

The Nether is as infinite as the surface horizontally, however, like the surface it is limited to 128 blocks in height. The only difference is that in the Nether there is bedrock above and below, whereas the surface only has it below.

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