Britannia In Scale using 15mm figures: I figure 4.6 km (2.8 mi.) by 8.1 km (4.9 mi.) is about enough for a properly sized map. This is just 37 sq. km (12.8 sq. mi.) or about 8,800 acres. A map of this scale would give you a good feel for what it takes to march an ancient an army to battle. I figure the plains near Fargo, North Dakota or Winnipeg, Canada would be an ideal site for the board. Depending on the lay of the land, we could use Jeeps or quadra-track cycles to find and move our pieces around the board. We would also need some room around the edges for our chairs and snacks.