27

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?

24

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.

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  • 3
    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
  • 3
    @Ullallulloo Rough – fredley Aug 10 '11 at 20:03
  • 3
    What about left and right? – alexy13 Aug 10 '11 at 20:22
  • 8
    @Alexy13 Provided you actually go really far, you will reach the Far Lands. – SourceTurtle Aug 10 '11 at 21:15
  • 1
    Really far, as in 32,000,000 (or more) blocks. – Joe the Person Oct 19 '11 at 22:14
14

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.

2

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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