Weird Resurrection Monolith

[Excelsior 56]

So I have a question about something pretty strange I saw on the map.

I was in the north of the swamp, near the portal that takes you back and forth from the Dragon Sea Islands to the swamp, and I saw a resurrection monolith icon in the middle of nowhere?  It was right on the edge of the map, between Swamp and Christmas Island.  Has anyone else ever encountered this?  If so, is there actually a way to get to that location?  It just seems like a bug to me, but it has me really curious.

Thanks