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After destroying the Wall of flesh, the corruption and new hallow start to spread aggressively. I've noticed that they can spread across air gaps and (I think) past terrain they can't assimilate. How large of a space can they cross?

Related Question: How can I halt the spread of corruption after winning hell?

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I'm certain that hallow, at least, can't cross a three blocks high gap, as in, a horizontal tunnel trough a hill can create some kind of grass island in the middle of the hallow. – Jupotter Dec 5 '11 at 18:52
@Jupotter I've only seen it cross a 2 block wide vertical tunnel, which makes me think you're right, but it's possible that the horizontal jump distance is different from the vertical (and bigger than 2). Also, I could see there being a difference in the vertical jump distance if the hallow is above the grass due to vines hanging down or just sheer cussedness. – Fambida Dec 5 '11 at 23:40
up vote 6 down vote accepted

The corruption itself cannot cross a gap, but if its vines grow across the gap, they will continue the spread of corruption on the other side.

Corruption/hallow can jump up to three blocks to affect other blocks. You can prevent them from doing so by digging a 4 block wide channel. You may be able to leave it empty, but if you have trouble with corrupted vines, you may need to either fill it with ash, which cannot be hallowed/corrupted, or wall the edges with stone so as to prevent the vines growing.

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This question is about the hardmode Corruption (and Hallow), for which this is definitely not true. I've seen Pearlstone clear a 2-block gap (as in, while I was looking at it). – a cat Dec 5 '11 at 17:33
Wow. Alright. I haven't actually gotten to hardmode yet, so I'm just going by what I've read. I'll be getting to that point tonight :D – SaintWacko Dec 5 '11 at 17:38
Found some more information for you. – SaintWacko Dec 8 '11 at 20:10
Stone is a bad idea as it can also be corrupted. Any kind of bricks is safe fro corruption. – Tomáš Zato Jun 30 at 13:54

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