We don't need specific places for PvP. Everything outside of tribal territory is fair game. That is how it should be, with the hope that eventually you'll be attackable within your own borders as well. Considering how large the world is, and how difficult it can be to see other players (which is a good thing), it is very unlikely that you'd ever get killed just sitting around crafting, even outside of your own tribal lands. Of course, you need to be smart when venturing beyond your own borders, but that's the nature of this game and the vision of the developers.