I always assumed that Erebus is actually referring to both the world and a large continent all of these people are on. It's actually confusing, because I think most of this is conflicting. For example, I always assumed that the Fane of Lessers was on an island as everyone seemingly had to sail there. Yet, Valledia the Even's entry talks about moving forces *away* from the coast onto shared borders with the Infernals, suggesting they're on the same land mass. It could be that Valledia's entry shouldn't be taken as canon or presents a "what if?" scenario due to the fact that the Infernals can appear nearly anywhere. Either way, I'd put the Elohim, Bannor, Lanun, and Amurites as relatively close to each other, with a common border or something.