Sunpu Castle (駿府城 Sunpu-jō) was a Japanese castle in Shizuoka City, Shizuoka Prefecture in Japan. The sobriquet of this feudal fortress was the "Castle of the Floating Isle."[1] It was also referred to as Fuchu Castle (府中城 Fuchū-jō?) or Shizuoka Castle (静岡城 Shizuoka-jō?).