Regions and Zones
Regions
According to the Encarta, "The game-map is divided into Regions, irregularly shaped chunks of terrain, generally following natural borders like rivers, streams, or shorelines. Regions are the basic map unit. Your Nation will be composed of a bunch of Regions. Forces move from Region to Region according to your orders. Multiple Forces can occupy the same Regions (they're large). Improvements (farms, camps, etc.) are constructed in Regions.
You begin your Nation in a single region that contains your Capital City: a small settlement which will ultimately grow into a large metropolis."
As cities level up, they will gain claims to add more regions to the their city. The new region must border an already claimed region of that city.
Zones
Regions are divided into 2 to 6 Zones.
Some zones have Resources. Not all of them will be visible until they are researched by the corresponding technology.
Zones are also where you place individual improvements, and each zone can only house one. You cannot build on a zone if it is occupied by predators or an enemy.
A triumph will take up all the zones in a region.
When a player founds a new city, they will place the initial improvement (Gathering Hall) on an individual zone. When players start a game, their capital already has a Great Hearth placed on an individual zone.