|Address||91-9 Usuki Nyujima, Usuki City, Oita Prefecture|
|Contact||Usuki City, Industrial Tourism Division|
Usuki Castle was constructed in 1562 by Kirishitan Daimyo Otomo Sorin on then Nyujima Island in the Bay of Usuki. Much of the domain history was made here at the main post of the Usuki Domain with annual rice yield measuring 50,000 koku.
The castle was initially surrounded by the body of water, completely. The area today is connected to the main land via a man-made landfill.
The Ruins is currently maintained as a part of Usuki Park, a top cherry blossom viewing spot in the southern Oita, with over 1,000 cherry trees beautifully blooming in spring season.