User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-2.122.196.62-20111007102929/@comment-50.105.30.204-20111010004633

In tri, area 4 was a lot bigger than its picture on the map due to various tunnels that didn't show up on the map (when you were in the tunnels, your icon was off the map). I guess in 3g, they decided to map all of it.