Gusuku Sites and Related Properties of the Kingdom of Ryukyu

Columns: Name | Type | Location
Tamaudun ( 玉陵 ) | mausoleum Mausoleum | naha Naha , Okinawa | Sonohyan-utaki Ishimon ( 園比屋武御嶽石門 , Okinawan : Sunuhwan-utaki ) | utaki Stone gate at utaki | naha Naha , Okinawa | Nakijin Castle Site ( 今帰仁城跡 , Nakijin-jō ato , Okinawan : Nachizin Gushiku ) | gusuku ruins Gusuku ruins | kunigami nakijin Nakijin , Kunigami , Okinawa | Zakimi Castle Site ( 座喜味城跡 , Zakimi-jō ato , Okinawan : Zachimi Gushiku ) | gusuku ruins Gusuku ruins | nakagami yomitan Yomitan , Nakagami , Okinawa | Katsuren Castle Site ( 勝連城跡跡 , Katsuren-jō ato , Okinawan : Katchin Gushiku ) | gusuku ruins Gusuku ruins | nakagami uruma Uruma , Nakagami , Okinawa | Nakagusuku Castle Site ( 中城城跡 , Nakagusuku-jō ato , Okinawan : Nakagusiku Gushiku ) | gusuku ruins Gusuku ruins | nakagami nakagusuku Nakagusuku , Nakagami , Okinawa | Shuri Castle Site ( 首里城跡 , Shuri-jō ato , Okinawan : Sui Gushiku ) | gusuku ruins Reconstructed Gusuku on site of ruins | Naha , Okinawa | Shikinaen ( 識名園 ) | garden Garden | naha Naha , Okinawa | Sefa-utaki ( 斎場御嶽 , Seefa-utaki ) | utaki Utaki | nanjo Nanjō , Okinawa

Example questions:
How big is the surface area of the district containing Zakimi Castle in square kilometers which belongs to Gusuku Sites during the Kingdom of Ryukyu ? | How many people live per square kilometer in the district which contains Nakagusuku Castle which belongs to Gusuku Sites during the Kingdom of Ryukyu ? | Which side of Okinawa is the district which contains Nakijin Castle which belongs to Gusuku Sites during the Kingdom of Ryukyu ? | What prefecture contains the city which contains Tamaudun which belongs to Gusuku Sites during the Kingdom of Ryukyu ?

Answers:
139.25 | 1,216.03 | northern | Okinawa