This observation point was established on the western side of the castle walls, at an altitude of approximately 130 meters above sea level. From here, the observer can command a view that includes the city of Naha and the port, as well as the Kerama Islands in the distant horizon.

Iri-no Azana is also known as the Shimasoe Azana, and long ago, flags were raised here and a bell was struck to signify the time. This is the best place to view the castle grounds as well as outside the castle.