国府尾城

Kounoo is a castle ruin situated on a strategic hilltop on Okinoshima island. The stone foundations and remaining walls follow the typical layout of a defensive position with views across the surrounding waters.

The fortress was built during Japan's feudal period to monitor maritime activities and protect coastal areas. It served as a key defensive position against threats from the sea and land.

The ruins reflect traditional Japanese fortification methods, with stone walls arranged in patterns that reveal military conventions of the time. These architectural features show how defenders adapted their designs to monitor approaching threats from the water.

Access is via marked trails through forested slopes of the island, best visited during daylight hours. Sturdy footwear is essential for navigating the uneven terrain.

The site sits on one of Japan's most restricted islands, accessible only to male visitors. This strict rule has protected the location from excessive development and change.

Location: Okinoshima

GPS coordinates: 36.20644,133.31983

Latest update: December 14, 2025 14:26