Fukuoka Castle Ruins.

“Fukuoka Castle (Fukuoka-jō) [was] completed in the early Edo period for tozama daimyō Kuroda Nagamasa. The castle lies in the centre of Fukuoka, on top of Fukusaki hill. The Naka River, Naka-gawa in Japanese, acts as a natural moat on the eastern side of the castle, while the western side uses a mudflat as a natural moat. Hakata, a ward with a bustling port, is located on the opposite side of the Naka River to the east. The castle town was established on the northern side, facing the sea.”