Jogaku Temple is a monk pagoda in the Jogaku prefecture, in northern Tsushima. The temple is occupied by Mongols but later freed by Jin Sakai and Yuna. It is used as their headquarters in preparation for the attack on Izumi.
Jogaku is the temple furthest to the north and is meant to feel very cold and quiet in the game. The frozen waterfalls inside the temple area are designed to reinforce the idea that it's almost frozen in time.
The Temple can be entered, and the armorer is located inside the interior of the temple.