The forest territories

The Old Territories (also referred to as "The Forest", "The Old Forest" or "The Forest Territories", although only a small part is covered by woodland) is the region that provides the setting of all six books of the Original Series, the first three books of the New Prophecy Series, and all books whose action takes place in parallel or before these. It consists of a vast and varied landscape, and it gives home to the five (later four) Clans that appear in the Warriors series.

History
The five Clans of feral cats were founded in this region many generations ago by five loners, Thunder, Shadow, River, Wind and Sky, who received dreams from their ancestors, becoming the first leaders of the resulting Clans, and developing the Warrior Code. The five Clans - ThunderClan, ShadowClan, RiverClan, WindClan and SkyClan - divided the hunting grounds between themselves, and adapted to the conditions that reigned on their territories.

The first to leave the territory was SkyClan, after Twolegs built a Twolegplace on their territory. Soon, the remaining four Clans were forced to leave as well, as Twolegs destroyed the region to construct a Thunderpath. They later settled by a lake, usually referred to as The New Territories.