Board Thread:Bug Reports/@comment-25684944-20150322111448/@comment-25565811-20150330080655

Longerbeard wrote: How do i know from where the region file(s) come? How do i see that? Coords? The region files are here AppData -> Roaming -> .minecraft -> saves -> (your filename) -> MiddleEarth -> region. They are called r.(x).(z).mca where (x) and (z) are the coords of the region. Each file contains 512x512x256 blocks, where 256 is the height. When you divided you x/z coords by 512, you'll get the region number.

E.g. x=2433 (2433/512=4.75), z=-814 (-814/512=-1.59) should be included in region file r.4.-2.mca if i calculated right. When the chunk error is there, by removing this file (make a backup before!) you could regenerate this region.

But Gflegolas is right: This moves the errors to other places, where now is the border between old and new. But only if the heights there differ also betweeen different mod versions.