Because in SpellMaster there were three islands, East South and West. The east Island was eponymous the eastern island of the three. The south island was actually the War-Islands (hence south-west, and south-east) The colonies map is actually the West Island map. It's also why there was a Lich King character there for a time as there was a Lich King character in SpellMaster.
Any other questions?
Though if there was a combination of the continents onto a single map, such locations should be taken into consideration.
