Echizen Ono Castle
Echizen Ono Castle had a large watchtower on the second and third floors with an observation tower in the main area and another smaller watchtower on the second floor. It also had multiple Kuruwa--districts limited by water, fence, or anything else. These districts were the secondary area of a castle (二ノ丸, Ninomaru) and the furthest outer area (三ノ丸, Sannomaru) at the beginning of the Kameyama mountain, connecting a canal and a river to protect the castle tower. Protecting the castle tower was important role for Echizen Ono castle.