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Well, I climbed all of them already except the fargrove roofs (but I managed to climb the roof in the Slum District and my brother once climbed into the Temple Catacombs before getting the key but he didn't manage to climb out again, so he had to load his game), and I also often climb a certain mountain in the south part of the Forbidden Lands. In fact, it's the easiest mountain to climb that I ever found - go to the entrance to the Black Moors and then hug the western mountain. Eventually there will be a lot of hills and an easy way to climb up, I always use this place to get past the stone heads. The reason for this is to get into Irynthabl where moonstones can be found (it's the only place other than Lost Lake that spawns moonbeasts). Also, it's possible to climb out of the black moors again somewhere at the south mountain but it takes a high amount of backflipping, patience and reloading to really get out of there, since if a bunch of harrowbarks spawns while you're trying to climb up there, you're hosed.