Board Thread:LotR Mod Technical Support/@comment-31393142-20170507212859/@comment-27219153-20170514172534

Your position is really close to the intersection of four region files, thus the problem could be in any one of them or even all of them. They are:
 * r.70.-40.mca
 * r.71.-40.mca
 * r.70.-41.mca
 * r.71.-41.mca