The ruins of Katsuren Castle Ruins are located in Haebaru at the base of the Katsuren peninsula, which juts out into the Pacific. There are three main successive enclosures structured in terraces up the apex at the first enclosure. At the base is a fourth stone wall enclosure where there were two arched gates called "Haebaru Ujou," at the south is the front gate and the other is on the opposite north side. Along the fourth enclosure, wells in four locations have been discovered. Within the castle, if an adequate supply of water could be secured, long-term support for the castle was possible. Much importance was attached to these water holes and much emphasis was placed on their defense. In the fourth stone wall enclosure, the east side was developed wide and the walls needed to be built higher to accomplish this. Connected to the fourth stone wall enclosure is the fifth, also called the "East Gusuku." There is a relationship between the height of the East Gusuku and the main enclosure, which are tall, and the fourth stone wall enclosure's relative lowness.

The ramparts that border Katsuren Castle were existent up to the Taisho Period (1912-1926), when a construction project was started on a nearby embankment and almost all the stones taken away for construction material..

The road upwards from the fourth enclosure inclines steeply and this is where this Gusuku's characteristics of being constructed to use height in battle are expressed. In the past era, the entrance to this enclosure had a large wooden gate called "Romon" and in the open space ceremonial and religious functions inside the castle were performed.

In the second enclosure, one tier up from the third, there was what is believed to the Aji chieftain's pavilion, akin to the Seiden main hall at Shuri Castle. Also, where the north side stone paved path heads upward is the first stonewall enclosure, the highest point within the castle. In the age when Katsuren Castle could boast of prosperity, there were arched gates constructed. From the first enclosure the view was enormous, with the whole of the castle in one view below the chain of mountains stretching northward. To the south lays the Chinen peninsula, all in one scene. It also includes a view of the Nakagusuku area, where the headquarters of an old enemy, Gosamaru, faced off against Amawari.

Results of research on this walled enclosure unearthed a wealth of Japanese-style roof tiles as well as a building constructed with tiles similar to those used on the Seiden main hall of Shuri Castle. It is said that the only palaces covered with ceramic roof tiles were Shuri Castle, Urasoe Gusuku, the base of the Chuzan kingdom previous to Shuri Castle, and Katsuren Gusuku.