Area: ca. 8,500㎡
Elevation: ca. 39m
Length (extension) ca. 60m
Height (extension) ca. 7m
Kitasumi-yagura (turret)・Minamisumi-yagura (turret)
Naga-yagura (turret)・Hidari-yagura (turret)
Migi-yagura (turret)・Nagatomaru-mon (gate)・Kawaya (Toilet)
It is the largest Kuruwa (compound) in the castle, located in the midsection of the mountain. It is also the place where you will find the longest stone wall in the castle structure and five yagura (turrets). The name Nagato-maru is said to be derived from the name of a senior vassal under Todo Takatora, and the name was used as it was even after it became the residence of the Date clan.
According to the historical materials of the Date clan, the five turrets were, the right and the left watchtower for the gatekeeper on either side of the Nagato-maru gate, Nishisumi-yagura for probably "No" play and musical instruments, Naga-yagura for construction materials, and Kitasumi-yagura for documents.
Dobei (earthen wall)
* The Japanese term "yagura" means tower or turret.
These structures served often as watchtowers, guardtowers or storages in Japanese castles.
（Folding screen “Uwajima castle” (Nagato-maru part) around 1703 ）
1. Remains of Kitasumi-yagura
The cornerstone of the yagura that formed the basis of the building is still preserved.
2. Stone wall construction
Although not drawn in the illustration, the area from Kitasumi-Yagura to Nishisumi-Yagura has been raised by one step with a stone mound to make it more robust.
3. Illustration Uwajima castle (Nagato-maru part) around 1711
（Illustration Uwajima castle (Nagato-maru part) around 1711）