Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
I have no idea what that is or where it came from. This "plateau" almost got this scrubbed. I have used flattens, excludes, ....... everything to get that out. I even made a mesh for the island.. it was still there. You don't see it until certain conditions so I ignored it and released it. This is the one problem that almost killed this.