Crash

There is an area of my realm that seems to trigger a crash when I go near it. Originally noticed a couple of lag spikes while riding minecart rails, and then the area that the spikes occurred on seem to trigger a crash whether I use the rails or walk in the area now. If I head in the opposite direction, then no issue. I have attempted to load previous saves, but continue to see it no matter how far back I go. Please advise.