Clan territory is your Clan's safe space within the Kingdom. Enemies can't teleport to your Clan territory, nor can they open portals there.
The limit of your Clan's territory is indicated by its border, which is dynamic and will change over time. The limits of a Clan's border depend on the current level of the border, which, in turn, is determined by the number of help points the Clan has accumulated.
Help points are consumed every second to maintain the existing border level. In the Border tab of your Capital, you can view the number of help points needed to upgrade your border level, the rate at which they are consumed, and the corresponding territory that is granted.
From the Territory tab of the Clan Capital, any player ranked Superior or higher can kick out unwanted players from the Clan's territory in exchange for 4M Silver.
Cities that are removed from a Clan's territory will be teleported to a random location on the Kingdom Map, outside the territory of the Clan that kicked them out.
Questions:
Q: My Clan building is outside Clan territory.
A: If you have a resource building outside Clan territory, you cannot send resources to it. However, you can move the building inside Clan territory.
Q: What happens when two Clans have clashing territories?
A: One Clan cannot take control over another Clan's territory. The first Clan to occupy the space gets to keep it.
If one Clan's territory shrinks, other Clans then have the opportunity to expand and take said territory.
Q: Can I place buildings outside Clan territory?
A: You can only place Forts outside Clan territory, which in turn will expand the territory.