I was thinking that Slice's lands would be somewhere in the forest where the environment begins to shift into a jungle. It'd be right beside a large cliff face with a big abandoned cave dug out of it. Inside is a huge hotspring with a waterfall that seems to come from a large gap in one of the walls. Outside, since it's partially jungle and partially forest, there are lots of birds and reptiles for Devil and Challenge to play with. Yes, I do spend too much time thinking about Sams. XD))