| 1．Agena Castle |
| Agena Castle (安慶名城, Agena jō, Okinawan: Agina Gushiku[1] or Aginaa Gushiku[2]) is a Ryukyuan gusuku located in the north of Agena district of Uruma, Okinawa, in former Gushikawa City. It was built on a base of Ryukyuan limestone and occupies 8,000 square metres (86,000 sq ft). Agena Castle sits at an altitude of 49 metres (161 ft), and is naturally protected by the Tengan River to the north.[3] |
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| 2．Iha Castle |
| Iha Castle (伊波城, Iha jō, Okinawan: Ifa Gushiku[1]) is a Ryukyuan gusuku in Uruma, Okinawa. It sits on a cliff that separates Iha from Ishikawa, with a grand view of the Ishikawa Isthmus. The castle is in ruins, with nothing left of the original structures save the walls. There are also multiple Ryukyuan shrines in the bailey. Based on artifacts found in and around the castle, it has been estimated to have been in use around the 13th to 15th centuries.[2] The Okinawa Prefectural government erected a stone Torii in front of one of the castle gates, along with a plaque describing it. |
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| 3．Katsuren Castle |
| Katsuren Castle (勝連城, Katsuren jō, Okinawan: Kacchin Gushiku[1]) is a Ryukyuan gusuku in Uruma, Okinawa. In 2000, Katsuren Castle was designated as a World Heritage Site, as a part of the Gusuku Sites and Related Properties of the Kingdom of Ryukyu.[2] |
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| 4．Kyan Castle |
| Kyan Castle (喜屋武城, Kyan jō, Okinawan: Chan Gushiku[1]) is a Ryukyuan gusuku in Uruma, Okinawa. It was controlled by the Ōgawa Aji of Agena Castle until it was destroyed by the Ryukyu Kingdom.[2] |
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