In hardmode, how large of a gap can hallow/corruption cross?

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?

Answer

Corruption, Crimson, and Hallow can jump up to three blocks to affect other blocks, and Corruption and Crimson can spread farther by using vines. 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 stop them with blocks that cannot be converted, such as Ash, Bricks, or Wood.

Attribution
Source : Link , Question Author : Fambida , Answer Author : Wrigglenite

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