Board Thread:General Discussion/@comment-25936766-20170820043030/@comment-4010415-20170823232430

From WoR: Between Kingdoms: "At this point, pretty much every inch of Remnant has been mapped out. Although there are some areas that no one's gone into and come out alive."

If I had to guess, the wyvern continent is one of those areas that "no one's gone into and come out alive."