The Tree House is where Sora first encountered Sabor. The Tree House is a fairly big area. The Tree House itself is huge with two floors, the rafters, and even the rooftop where battles can take place. A small, wooden boat hangs off of a long wooden board that extends out over the jungle. Directly underneath the Tree House is a large web of netting. There is even a special, dark spot hidden right underneath the Tree House where some Heartless can hide from time to time, so be sure to check this spot when on missions in this area. Finally, the path leading down into the Climbing Trees area has many wooden steps, as the slope can be kind of rough.
