Can't help with the map, but can tell you that the 6 counties of the north are, derry, antrim, down, armagh, fermanagh and tyrone. (We learnt this by rote in school- co. down). These counties are all in the province of Ulster( The island of Ireland is made up of 4 provinces, the others being Connaught, Leinster, and Munster) and will have a postcode beginning BT , however, just to confuse things, 3 other counties in Southern Ireland are also in Ulster (Donegal, monaghan and cavan) but they are not subject to british rule, like the north.